12516639 has 8 divisors (see below), whose sum is σ = 17003952. Its totient is φ = 8186880.

The previous prime is 12516631. The next prime is 12516643. The reversal of 12516639 is 93661521.

It is a happy number.

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

It is not a de Polignac number, because 12516639 - 2³ = 12516631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12516631) 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, 39202 + ... + 39519.

It is an arithmetic number, because the mean of its divisors is an integer number (2125494).

Almost surely, 2^12516639 is an apocalyptic number.

12516639 is a deficient number, since it is larger than the sum of its proper divisors (4487313).

12516639 is an equidigital number, since it uses as much as digits as its factorization.

12516639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78777.

The product of its digits is 9720, while the sum is 33.

The square root of 12516639 is about 3537.8862333320. The cubic root of 12516639 is about 232.1823712191.

The spelling of 12516639 in words is "twelve million, five hundred sixteen thousand, six hundred thirty-nine".