18156764 has 6 divisors (see below), whose sum is σ = 31774344. Its totient is φ = 9078380.

The previous prime is 18156763. The next prime is 18156767. The reversal of 18156764 is 46765181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18156763) 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 as a sum of consecutive naturals, namely, 2269592 + ... + 2269599.

It is an arithmetic number, because the mean of its divisors is an integer number (5295724).

Almost surely, 2^18156764 is an apocalyptic number.

It is an amenable number.

18156764 is a deficient number, since it is larger than the sum of its proper divisors (13617580).

18156764 is a wasteful number, since it uses less digits than its factorization.

18156764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4539195 (or 4539193 counting only the distinct ones).

The product of its digits is 40320, while the sum is 38.

The square root of 18156764 is about 4261.0754511039. The cubic root of 18156764 is about 262.8327523165.

The spelling of 18156764 in words is "eighteen million, one hundred fifty-six thousand, seven hundred sixty-four".