18311952 has 40 divisors (see below), whose sum is σ = 48318336. Its totient is φ = 5973376.

The previous prime is 18311947. The next prime is 18311957. The reversal of 18311952 is 25911381.

It is an interprime number because it is at equal distance from previous prime (18311947) and next prime (18311957).

It is not an unprimeable number, because it can be changed into a prime (18311957) 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, 1803 + ... + 6314.

Almost surely, 2^18311952 is an apocalyptic number.

18311952 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18311952 is an abundant number, since it is smaller than the sum of its proper divisors (30006384).

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

18311952 is a wasteful number, since it uses less digits than its factorization.

18311952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8175 (or 8169 counting only the distinct ones).

The product of its digits is 2160, while the sum is 30.

The square root of 18311952 is about 4279.2466626732. The cubic root of 18311952 is about 263.5794497977.

The spelling of 18311952 in words is "eighteen million, three hundred eleven thousand, nine hundred fifty-two".