12639578 has 8 divisors (see below), whose sum is σ = 21667872. Its totient is φ = 5416956.

The previous prime is 12639577. The next prime is 12639637. The reversal of 12639578 is 87593621.

12639578 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 not an unprimeable number, because it can be changed into a prime (12639577) 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, 451400 + ... + 451427.

It is an arithmetic number, because the mean of its divisors is an integer number (2708484).

Almost surely, 2^12639578 is an apocalyptic number.

12639578 is a deficient number, since it is larger than the sum of its proper divisors (9028294).

12639578 is an equidigital number, since it uses as much as digits as its factorization.

12639578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902836.

The product of its digits is 90720, while the sum is 41.

The square root of 12639578 is about 3555.2184180441. The cubic root of 12639578 is about 232.9400645264.

The spelling of 12639578 in words is "twelve million, six hundred thirty-nine thousand, five hundred seventy-eight".