18501812 has 18 divisors (see below), whose sum is σ = 37664802. Its totient is φ = 7929264.

The previous prime is 18501803. The next prime is 18501817. The reversal of 18501812 is 21810581.

It can be written as a sum of positive squares in only one way, i.e., 14714896 + 3786916 = 3836^2 + 1946^2 .

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18501817) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 47003 + ... + 47394.

It is an arithmetic number, because the mean of its divisors is an integer number (2092489).

Almost surely, 2^18501812 is an apocalyptic number.

It is an amenable number.

18501812 is an abundant number, since it is smaller than the sum of its proper divisors (19162990).

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

18501812 is a wasteful number, since it uses less digits than its factorization.

18501812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94415 (or 94406 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 26.

The square root of 18501812 is about 4301.3732690851. The cubic root of 18501812 is about 264.4872582225.

The spelling of 18501812 in words is "eighteen million, five hundred one thousand, eight hundred twelve".