13278393 has 12 divisors (see below), whose sum is σ = 19588608. Its totient is φ = 8663640.

The previous prime is 13278389. The next prime is 13278401. The reversal of 13278393 is 39387231.

It is a happy number.

It is not a de Polignac number, because 13278393 - 2² = 13278389 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13278493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15273 + ... + 16118.

It is an arithmetic number, because the mean of its divisors is an integer number (1632384).

Almost surely, 2^13278393 is an apocalyptic number.

It is an amenable number.

13278393 is a deficient number, since it is larger than the sum of its proper divisors (6310215).

13278393 is a wasteful number, since it uses less digits than its factorization.

13278393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31444 (or 31441 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 13278393 is about 3643.9529360298. The cubic root of 13278393 is about 236.8000770883.

The spelling of 13278393 in words is "thirteen million, two hundred seventy-eight thousand, three hundred ninety-three".