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18219829 = 40074547
BaseRepresentation
bin100010110000…
…0001100110101
31021021122220111
41011200030311
514131013304
61450303021
7310603015
oct105401465
937248814
1018219829
11a314911
126127a71
133a0c084
1425c3c45
1518ed704
hex1160335

18219829 has 4 divisors (see below), whose sum is σ = 18228384. Its totient is φ = 18211276.

The previous prime is 18219827. The next prime is 18219833. The reversal of 18219829 is 92891281.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18219829 - 21 = 18219827 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18219791 and 18219800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18219821) by changing a digit.

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, 1734 + ... + 6280.

It is an arithmetic number, because the mean of its divisors is an integer number (4557096).

Almost surely, 218219829 is an apocalyptic number.

It is an amenable number.

18219829 is a deficient number, since it is larger than the sum of its proper divisors (8555).

18219829 is an equidigital number, since it uses as much as digits as its factorization.

18219829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8554.

The product of its digits is 20736, while the sum is 40.

The square root of 18219829 is about 4268.4691635292. The cubic root of 18219829 is about 263.1367050384.

The spelling of 18219829 in words is "eighteen million, two hundred nineteen thousand, eight hundred twenty-nine".

Divisors: 1 4007 4547 18219829