139513979 has 8 divisors (see below), whose sum is σ = 160207680. Its totient is φ = 120155400.

The previous prime is 139513963. The next prime is 139513993. The reversal of 139513979 is 979315931.

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 139513979 - 2⁴ = 139513963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139513909) 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, 333557 + ... + 333974.

It is an arithmetic number, because the mean of its divisors is an integer number (20025960).

Almost surely, 2^139513979 is an apocalyptic number.

139513979 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

139513979 is a deficient number, since it is larger than the sum of its proper divisors (20693701).

139513979 is a wasteful number, since it uses less digits than its factorization.

139513979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667561.

The product of its digits is 229635, while the sum is 47.

The square root of 139513979 is about 11811.6035744517. The cubic root of 139513979 is about 518.6478418080.

It can be divided in two parts, 139 and 513979, that multiplied together give a triangular number (71443081 = T₁₁₉₅₃).

The spelling of 139513979 in words is "one hundred thirty-nine million, five hundred thirteen thousand, nine hundred seventy-nine".