18531916 has 24 divisors (see below), whose sum is σ = 36765680. Its totient is φ = 8102592.

The previous prime is 18531911. The next prime is 18531917. The reversal of 18531916 is 61913581.

It is not an unprimeable number, because it can be changed into a prime (18531911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8391 + ... + 10366.

Almost surely, 2^18531916 is an apocalyptic number.

It is an amenable number.

18531916 is a deficient number, since it is larger than the sum of its proper divisors (18233764).

18531916 is a wasteful number, since it uses less digits than its factorization.

18531916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18793 (or 18791 counting only the distinct ones).

The product of its digits is 6480, while the sum is 34.

The square root of 18531916 is about 4304.8711943565. The cubic root of 18531916 is about 264.6306281434.

The spelling of 18531916 in words is "eighteen million, five hundred thirty-one thousand, nine hundred sixteen".