18805019 has 16 divisors (see below), whose sum is σ = 20040384. Its totient is φ = 17625600.

The previous prime is 18805013. The next prime is 18805027. The reversal of 18805019 is 91050881.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18805019 is a prime.

It is a super-2 number, since 2×18805019² = 707257479180722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18805013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182522 + ... + 182624.

It is an arithmetic number, because the mean of its divisors is an integer number (1252524).

Almost surely, 2^18805019 is an apocalyptic number.

18805019 is a deficient number, since it is larger than the sum of its proper divisors (1235365).

18805019 is a wasteful number, since it uses less digits than its factorization.

18805019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278.

The product of its (nonzero) digits is 2880, while the sum is 32.

The square root of 18805019 is about 4336.4754121291. The cubic root of 18805019 is about 265.9242392643.

The spelling of 18805019 in words is "eighteen million, eight hundred five thousand, nineteen".