18112520 has 16 divisors (see below), whose sum is σ = 40753260. Its totient is φ = 7244992.

The previous prime is 18112517. The next prime is 18112543. The reversal of 18112520 is 2521181.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15007876 + 3104644 = 3874^2 + 1762^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 18112492 and 18112501.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226367 + ... + 226446.

Almost surely, 2^18112520 is an apocalyptic number.

18112520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18112520 is an abundant number, since it is smaller than the sum of its proper divisors (22640740).

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

18112520 is a wasteful number, since it uses less digits than its factorization.

18112520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452824 (or 452820 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 18112520 is about 4255.8806374239. The cubic root of 18112520 is about 262.6190903321.

The spelling of 18112520 in words is "eighteen million, one hundred twelve thousand, five hundred twenty".