12639215 has 16 divisors (see below), whose sum is σ = 15936480. Its totient is φ = 9609600.

The previous prime is 12639203. The next prime is 12639217. The reversal of 12639215 is 51293621.

It is not a de Polignac number, because 12639215 - 2¹⁶ = 12573679 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12639217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9065 + ... + 10365.

It is an arithmetic number, because the mean of its divisors is an integer number (996030).

Almost surely, 2^12639215 is an apocalyptic number.

12639215 is a deficient number, since it is larger than the sum of its proper divisors (3297265).

12639215 is a wasteful number, since it uses less digits than its factorization.

12639215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1402.

The product of its digits is 3240, while the sum is 29.

The square root of 12639215 is about 3555.1673659618. The cubic root of 12639215 is about 232.9378345455.

The spelling of 12639215 in words is "twelve million, six hundred thirty-nine thousand, two hundred fifteen".