12539530 has 8 divisors (see below), whose sum is σ = 22571172. Its totient is φ = 5015808.

The previous prime is 12539509. The next prime is 12539537. The reversal of 12539530 is 3593521.

It can be written as a sum of positive squares in 2 ways, for example, as 11881809 + 657721 = 3447^2 + 811^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (12539537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 626967 + ... + 626986.

Almost surely, 2^12539530 is an apocalyptic number.

12539530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12539530 is a deficient number, since it is larger than the sum of its proper divisors (10031642).

12539530 is a wasteful number, since it uses less digits than its factorization.

12539530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1253960.

The product of its (nonzero) digits is 4050, while the sum is 28.

The square root of 12539530 is about 3541.1198793602. The cubic root of 12539530 is about 232.3238269222.

The spelling of 12539530 in words is "twelve million, five hundred thirty-nine thousand, five hundred thirty".