18871912 has 16 divisors (see below), whose sum is σ = 35488800. Its totient is φ = 9408240.

The previous prime is 18871907. The next prime is 18871913. The reversal of 18871912 is 21917881.

It is a super-2 number, since 2×18871912² = 712298125071488, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18871913) 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, 414 + ... + 6157.

It is an arithmetic number, because the mean of its divisors is an integer number (2218050).

Almost surely, 2^18871912 is an apocalyptic number.

It is an amenable number.

18871912 is a deficient number, since it is larger than the sum of its proper divisors (16616888).

18871912 is a wasteful number, since it uses less digits than its factorization.

18871912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6936 (or 6932 counting only the distinct ones).

The product of its digits is 8064, while the sum is 37.

The square root of 18871912 is about 4344.1813958443. The cubic root of 18871912 is about 266.2391803519.

The spelling of 18871912 in words is "eighteen million, eight hundred seventy-one thousand, nine hundred twelve".