18131964 has 24 divisors (see below), whose sum is σ = 42532560. Its totient is φ = 6011904.

The previous prime is 18131951. The next prime is 18131977. The reversal of 18131964 is 46913181.

It is an interprime number because it is at equal distance from previous prime (18131951) and next prime (18131977).

It is a congruent number.

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, 1599 + ... + 6230.

It is an arithmetic number, because the mean of its divisors is an integer number (1772190).

Almost surely, 2^18131964 is an apocalyptic number.

It is an amenable number.

18131964 is an abundant number, since it is smaller than the sum of its proper divisors (24400596).

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

18131964 is a wasteful number, since it uses less digits than its factorization.

18131964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8029 (or 8027 counting only the distinct ones).

The product of its digits is 5184, while the sum is 33.

The square root of 18131964 is about 4258.1643932568. The cubic root of 18131964 is about 262.7130316028.

The spelling of 18131964 in words is "eighteen million, one hundred thirty-one thousand, nine hundred sixty-four".