13139878 has 16 divisors (see below), whose sum is σ = 20956320. Its totient is φ = 6157696.

The previous prime is 13139873. The next prime is 13139879. The reversal of 13139878 is 87893131.

It is a self number, because there is not a number n which added to its sum of digits gives 13139878.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13139873) 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, 9303 + ... + 10621.

It is an arithmetic number, because the mean of its divisors is an integer number (1309770).

Almost surely, 2^13139878 is an apocalyptic number.

13139878 is a deficient number, since it is larger than the sum of its proper divisors (7816442).

13139878 is a wasteful number, since it uses less digits than its factorization.

13139878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1631.

The product of its digits is 36288, while the sum is 40.

The square root of 13139878 is about 3624.8969640529. The cubic root of 13139878 is about 235.9737953285.

The spelling of 13139878 in words is "thirteen million, one hundred thirty-nine thousand, eight hundred seventy-eight".