18012520 has 32 divisors (see below), whose sum is σ = 42913800. Its totient is φ = 6780928.

The previous prime is 18012499. The next prime is 18012541. The reversal of 18012520 is 2521081.

It is an interprime number because it is at equal distance from previous prime (18012499) and next prime (18012541).

It can be written as a sum of positive squares in 4 ways, for example, as 14485636 + 3526884 = 3806^2 + 1878^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 12565 + ... + 13924.

Almost surely, 2^18012520 is an apocalyptic number.

18012520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18012520 is an abundant number, since it is smaller than the sum of its proper divisors (24901280).

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

18012520 is a wasteful number, since it uses less digits than its factorization.

18012520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26517 (or 26513 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 18012520 is about 4244.1159267862. The cubic root of 18012520 is about 262.1348877130.

The spelling of 18012520 in words is "eighteen million, twelve thousand, five hundred twenty".