18311136 has 48 divisors (see below), whose sum is σ = 50601600. Its totient is φ = 5781888.

The previous prime is 18311131. The next prime is 18311141. The reversal of 18311136 is 63111381.

It is an interprime number because it is at equal distance from previous prime (18311131) and next prime (18311141).

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×18311136² = 670595403220992, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18311131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3196 + ... + 6843.

It is an arithmetic number, because the mean of its divisors is an integer number (1054200).

Almost surely, 2^18311136 is an apocalyptic number.

18311136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18311136 is an abundant number, since it is smaller than the sum of its proper divisors (32290464).

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

18311136 is a wasteful number, since it uses less digits than its factorization.

18311136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10071 (or 10063 counting only the distinct ones).

The product of its digits is 432, while the sum is 24.

The square root of 18311136 is about 4279.1513177264. The cubic root of 18311136 is about 263.5755346129.

The spelling of 18311136 in words is "eighteen million, three hundred eleven thousand, one hundred thirty-six".