139801279 has 4 divisors (see below), whose sum is σ = 139935600. Its totient is φ = 139666960.

The previous prime is 139801261. The next prime is 139801283. The reversal of 139801279 is 972108931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 972108931 = 8389 ⋅115879.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139801279 is a prime.

It is a super-2 number, since 2×139801279² = 39088795220071682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139801229) 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, 65587 + ... + 67684.

It is an arithmetic number, because the mean of its divisors is an integer number (34983900).

Almost surely, 2^139801279 is an apocalyptic number.

139801279 is a deficient number, since it is larger than the sum of its proper divisors (134321).

139801279 is a wasteful number, since it uses less digits than its factorization.

139801279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134320.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 139801279 is about 11823.7590892237. The cubic root of 139801279 is about 519.0036134650.

The spelling of 139801279 in words is "one hundred thirty-nine million, eight hundred one thousand, two hundred seventy-nine".