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18819349 = 139135391
BaseRepresentation
bin100011111001…
…0100100010101
31022102010021221
41013302210111
514304204344
61511210341
7315650623
oct107624425
938363257
1018819349
11a69428a
1263769b1
133b8bc13
1426dc513
1519bb184
hex11f2915

18819349 has 4 divisors (see below), whose sum is σ = 18954880. Its totient is φ = 18683820.

The previous prime is 18819341. The next prime is 18819371. The reversal of 18819349 is 94391881.

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.

It is a cyclic number.

It is not a de Polignac number, because 18819349 - 23 = 18819341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18819341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67557 + ... + 67834.

It is an arithmetic number, because the mean of its divisors is an integer number (4738720).

Almost surely, 218819349 is an apocalyptic number.

It is an amenable number.

18819349 is a deficient number, since it is larger than the sum of its proper divisors (135531).

18819349 is a wasteful number, since it uses less digits than its factorization.

18819349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135530.

The product of its digits is 62208, while the sum is 43.

The square root of 18819349 is about 4338.1273609704. The cubic root of 18819349 is about 265.9917695835.

The spelling of 18819349 in words is "eighteen million, eight hundred nineteen thousand, three hundred forty-nine".

Divisors: 1 139 135391 18819349