12539820 has 24 divisors (see below), whose sum is σ = 35111664. Its totient is φ = 3343936.

The previous prime is 12539819. The next prime is 12539843. The reversal of 12539820 is 2893521.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104439 + ... + 104558.

It is an arithmetic number, because the mean of its divisors is an integer number (1462986).

Almost surely, 2^12539820 is an apocalyptic number.

12539820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12539820 is an abundant number, since it is smaller than the sum of its proper divisors (22571844).

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

12539820 is a wasteful number, since it uses less digits than its factorization.

12539820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209009 (or 209007 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 12539820 is about 3541.1608266217. The cubic root of 12539820 is about 232.3256178822.

The spelling of 12539820 in words is "twelve million, five hundred thirty-nine thousand, eight hundred twenty".