12639378 has 8 divisors (see below), whose sum is σ = 25278768. Its totient is φ = 4213124.

The previous prime is 12639371. The next prime is 12639379. The reversal of 12639378 is 87393621.

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

12639378 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (12639371) 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, 1053276 + ... + 1053287.

It is an arithmetic number, because the mean of its divisors is an integer number (3159846).

Almost surely, 2^12639378 is an apocalyptic number.

12639378 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12639378 is a wasteful number, since it uses less digits than its factorization.

12639378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2106568.

The product of its digits is 54432, while the sum is 39.

The square root of 12639378 is about 3555.1902902658. The cubic root of 12639378 is about 232.9388358921.

The spelling of 12639378 in words is "twelve million, six hundred thirty-nine thousand, three hundred seventy-eight".