18313956 has 36 divisors (see below), whose sum is σ = 46532304. Its totient is φ = 6073200.

The previous prime is 18313951. The next prime is 18313961. The reversal of 18313956 is 65931381.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18313951) and next prime (18313961).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 18313956.

It is not an unprimeable number, because it can be changed into a prime (18313951) 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 11 ways as a sum of consecutive naturals, for example, 6391 + ... + 8801.

It is an arithmetic number, because the mean of its divisors is an integer number (1292564).

Almost surely, 2^18313956 is an apocalyptic number.

It is an amenable number.

18313956 is an abundant number, since it is smaller than the sum of its proper divisors (28218348).

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

18313956 is a wasteful number, since it uses less digits than its factorization.

18313956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2632 (or 2627 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 18313956 is about 4279.4808096310. The cubic root of 18313956 is about 263.5890645373.

The spelling of 18313956 in words is "eighteen million, three hundred thirteen thousand, nine hundred fifty-six".