13278639 has 8 divisors (see below), whose sum is σ = 19314432. Its totient is φ = 8047640.

The previous prime is 13278637. The next prime is 13278667. The reversal of 13278639 is 93687231.

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 13278639 - 2¹ = 13278637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13278597 and 13278606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13278637) 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, 201159 + ... + 201224.

It is an arithmetic number, because the mean of its divisors is an integer number (2414304).

Almost surely, 2^13278639 is an apocalyptic number.

13278639 is a deficient number, since it is larger than the sum of its proper divisors (6035793).

13278639 is a wasteful number, since it uses less digits than its factorization.

13278639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402397.

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

The square root of 13278639 is about 3643.9866904257. The cubic root of 13278639 is about 236.8015394253.

The spelling of 13278639 in words is "thirteen million, two hundred seventy-eight thousand, six hundred thirty-nine".