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18419629 = 47391907
BaseRepresentation
bin100011001000…
…0111110101101
31021122210222111
41012100332231
514203412004
61454444021
7312364354
oct106207655
937583874
1018419629
11a440a38
126203611
133a7bcb7
14263699b
15193ca04
hex1190fad

18419629 has 4 divisors (see below), whose sum is σ = 18811584. Its totient is φ = 18027676.

The previous prime is 18419617. The next prime is 18419633. The reversal of 18419629 is 92691481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 92691481 = 194878499.

It is a cyclic number.

It is not a de Polignac number, because 18419629 - 29 = 18419117 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18419591 and 18419600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18419689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195907 + ... + 196000.

It is an arithmetic number, because the mean of its divisors is an integer number (4702896).

Almost surely, 218419629 is an apocalyptic number.

It is an amenable number.

18419629 is a deficient number, since it is larger than the sum of its proper divisors (391955).

18419629 is an equidigital number, since it uses as much as digits as its factorization.

18419629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391954.

The product of its digits is 31104, while the sum is 40.

The square root of 18419629 is about 4291.8095251304. The cubic root of 18419629 is about 264.0950692575.

The spelling of 18419629 in words is "eighteen million, four hundred nineteen thousand, six hundred twenty-nine".

Divisors: 1 47 391907 18419629