13138779 has 16 divisors (see below), whose sum is σ = 18057600. Its totient is φ = 8492736.

The previous prime is 13138771. The next prime is 13138781. The reversal of 13138779 is 97783131.

It is a happy number.

It is not a de Polignac number, because 13138779 - 2³ = 13138771 is a prime.

It is a super-2 number, since 2×13138779² = 345255027221682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13138771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22807 + ... + 23375.

It is an arithmetic number, because the mean of its divisors is an integer number (1128600).

Almost surely, 2^13138779 is an apocalyptic number.

13138779 is a deficient number, since it is larger than the sum of its proper divisors (4918821).

13138779 is a wasteful number, since it uses less digits than its factorization.

13138779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794.

The product of its digits is 31752, while the sum is 39.

The square root of 13138779 is about 3624.7453703674. The cubic root of 13138779 is about 235.9672163118.

The spelling of 13138779 in words is "thirteen million, one hundred thirty-eight thousand, seven hundred seventy-nine".