12639819 has 8 divisors (see below), whose sum is σ = 16966800. Its totient is φ = 8369696.

The previous prime is 12639817. The next prime is 12639827. The reversal of 12639819 is 91893621.

12639819 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 12639819 - 2¹ = 12639817 is a prime.

It is a super-2 number, since 2×12639819² = 319530048705522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12639817) 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, 13692 + ... + 14585.

It is an arithmetic number, because the mean of its divisors is an integer number (2120850).

Almost surely, 2^12639819 is an apocalyptic number.

12639819 is a deficient number, since it is larger than the sum of its proper divisors (4326981).

12639819 is a wasteful number, since it uses less digits than its factorization.

12639819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28429.

The product of its digits is 23328, while the sum is 39.

The square root of 12639819 is about 3555.2523117213. The cubic root of 12639819 is about 232.9415450136.

The spelling of 12639819 in words is "twelve million, six hundred thirty-nine thousand, eight hundred nineteen".