18231996 has 12 divisors (see below), whose sum is σ = 42541352. Its totient is φ = 6077328.

The previous prime is 18231991. The next prime is 18232021. The reversal of 18231996 is 69913281.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18231991) 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, 759655 + ... + 759678.

Almost surely, 2^18231996 is an apocalyptic number.

It is an amenable number.

18231996 is an abundant number, since it is smaller than the sum of its proper divisors (24309356).

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

18231996 is a wasteful number, since it uses less digits than its factorization.

18231996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1519340 (or 1519338 counting only the distinct ones).

The product of its digits is 23328, while the sum is 39.

The square root of 18231996 is about 4269.8941438869. The cubic root of 18231996 is about 263.1952652641.

The spelling of 18231996 in words is "eighteen million, two hundred thirty-one thousand, nine hundred ninety-six".