18131916 has 24 divisors (see below), whose sum is σ = 46154304. Its totient is φ = 5494480.

The previous prime is 18131879. The next prime is 18131921. The reversal of 18131916 is 61913181.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a plaindrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68550 + ... + 68813.

It is an arithmetic number, because the mean of its divisors is an integer number (1923096).

Almost surely, 2^18131916 is an apocalyptic number.

It is an amenable number.

18131916 is an abundant number, since it is smaller than the sum of its proper divisors (28022388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18131916 is a wasteful number, since it uses less digits than its factorization.

18131916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137381 (or 137379 counting only the distinct ones).

The product of its digits is 1296, while the sum is 30.

The square root of 18131916 is about 4258.1587570216. The cubic root of 18131916 is about 262.7127997795.

The spelling of 18131916 in words is "eighteen million, one hundred thirty-one thousand, nine hundred sixteen".