18180936 has 40 divisors (see below), whose sum is σ = 50925270. Its totient is φ = 6060096.

The previous prime is 18180931. The next prime is 18180937. The reversal of 18180936 is 63908181.

It can be written as a sum of positive squares in only one way, i.e., 15256836 + 2924100 = 3906^2 + 1710^2 .

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 18180936.

It is not an unprimeable number, because it can be changed into a prime (18180931) 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 9 ways as a sum of consecutive naturals, for example, 13381 + ... + 14676.

Almost surely, 2^18180936 is an apocalyptic number.

It is an amenable number.

18180936 is an abundant number, since it is smaller than the sum of its proper divisors (32744334).

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

18180936 is a wasteful number, since it uses less digits than its factorization.

18180936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28075 (or 28062 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 18180936 is about 4263.9108808698. The cubic root of 18180936 is about 262.9493365281.

The spelling of 18180936 in words is "eighteen million, one hundred eighty thousand, nine hundred thirty-six".