18309368 has 32 divisors (see below), whose sum is σ = 42802560. Its totient is φ = 7133280.

The previous prime is 18309341. The next prime is 18309371. The reversal of 18309368 is 86390381.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

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, 14246 + ... + 15477.

It is an arithmetic number, because the mean of its divisors is an integer number (1337580).

Almost surely, 2^18309368 is an apocalyptic number.

It is an amenable number.

18309368 is an abundant number, since it is smaller than the sum of its proper divisors (24493192).

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

18309368 is a wasteful number, since it uses less digits than its factorization.

18309368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29747 (or 29743 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 18309368 is about 4278.9447297202. The cubic root of 18309368 is about 263.5670513136.

It can be divided in two parts, 1830 and 9368, that multiplied together give a triangular number (17143440 = T₅₈₅₅).

The spelling of 18309368 in words is "eighteen million, three hundred nine thousand, three hundred sixty-eight".