13138939 has 4 divisors (see below), whose sum is σ = 14333400. Its totient is φ = 11944480.

The previous prime is 13138933. The next prime is 13138949. The reversal of 13138939 is 93983131.

13138939 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93983131 = 11 ⋅8543921.

It is a cyclic number.

It is not a de Polignac number, because 13138939 - 2¹⁷ = 13007867 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13138898 and 13138907.

It is not an unprimeable number, because it can be changed into a prime (13138933) 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, 597214 + ... + 597235.

It is an arithmetic number, because the mean of its divisors is an integer number (3583350).

Almost surely, 2^13138939 is an apocalyptic number.

13138939 is a deficient number, since it is larger than the sum of its proper divisors (1194461).

13138939 is a wasteful number, since it uses less digits than its factorization.

13138939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1194460.

The product of its digits is 17496, while the sum is 37.

The square root of 13138939 is about 3624.7674408160. The cubic root of 13138939 is about 235.9681741532.

The spelling of 13138939 in words is "thirteen million, one hundred thirty-eight thousand, nine hundred thirty-nine".