12539640 has 64 divisors (see below), whose sum is σ = 38102400. Its totient is φ = 3300992.

The previous prime is 12539603. The next prime is 12539663. The reversal of 12539640 is 4693521.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 12539598 and 12539607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9331 + ... + 10589.

It is an arithmetic number, because the mean of its divisors is an integer number (595350).

Almost surely, 2^12539640 is an apocalyptic number.

12539640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12539640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19051200).

12539640 is an abundant number, since it is smaller than the sum of its proper divisors (25562760).

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

12539640 is a wasteful number, since it uses less digits than its factorization.

12539640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1356 (or 1352 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 12539640 is about 3541.1354111358. The cubic root of 12539640 is about 232.3245062551.

The spelling of 12539640 in words is "twelve million, five hundred thirty-nine thousand, six hundred forty".