12540388 has 24 divisors (see below), whose sum is σ = 25204032. Its totient is φ = 5348064.

The previous prime is 12540377. The next prime is 12540389. The reversal of 12540388 is 88304521.

It is a super-2 number, since 2×12540388² = 314522662381088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12540389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5370 + ... + 7342.

It is an arithmetic number, because the mean of its divisors is an integer number (1050168).

Almost surely, 2^12540388 is an apocalyptic number.

It is an amenable number.

12540388 is an abundant number, since it is smaller than the sum of its proper divisors (12663644).

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

12540388 is a wasteful number, since it uses less digits than its factorization.

12540388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2211 (or 2209 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 12540388 is about 3541.2410254034. The cubic root of 12540388 is about 232.3291256136.

The spelling of 12540388 in words is "twelve million, five hundred forty thousand, three hundred eighty-eight".