12520839 has 4 divisors (see below), whose sum is σ = 16694456. Its totient is φ = 8347224.

The previous prime is 12520831. The next prime is 12520853. The reversal of 12520839 is 93802521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93802521 = 3 ⋅31267507.

It is not a de Polignac number, because 12520839 - 2³ = 12520831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12520831) 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, 2086804 + ... + 2086809.

It is an arithmetic number, because the mean of its divisors is an integer number (4173614).

Almost surely, 2^12520839 is an apocalyptic number.

12520839 is a deficient number, since it is larger than the sum of its proper divisors (4173617).

12520839 is an equidigital number, since it uses as much as digits as its factorization.

12520839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4173616.

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

The square root of 12520839 is about 3538.4797583143. The cubic root of 12520839 is about 232.2083381715.

The spelling of 12520839 in words is "twelve million, five hundred twenty thousand, eight hundred thirty-nine".