18899105 has 4 divisors (see below), whose sum is σ = 22678932. Its totient is φ = 15119280.

The previous prime is 18899099. The next prime is 18899113. The reversal of 18899105 is 50199881.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10471696 + 8427409 = 3236^2 + 2903^2 .

It is not a de Polignac number, because 18899105 - 2²⁰ = 17850529 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1889906 + ... + 1889915.

It is an arithmetic number, because the mean of its divisors is an integer number (5669733).

Almost surely, 2^18899105 is an apocalyptic number.

It is an amenable number.

18899105 is a deficient number, since it is larger than the sum of its proper divisors (3779827).

18899105 is an equidigital number, since it uses as much as digits as its factorization.

18899105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3779826.

The product of its (nonzero) digits is 25920, while the sum is 41.

The square root of 18899105 is about 4347.3100878589. The cubic root of 18899105 is about 266.3669958316.

The spelling of 18899105 in words is "eighteen million, eight hundred ninety-nine thousand, one hundred five".