139708831 has 8 divisors (see below), whose sum is σ = 146442240. Its totient is φ = 133030392.

The previous prime is 139708819. The next prime is 139708867. The reversal of 139708831 is 138807931.

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 139708831 - 2⁹ = 139708319 is a prime.

It is a super-2 number, since 2×139708831² = 39037114918773122, 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 (139708031) 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, 8491 + ... + 18748.

It is an arithmetic number, because the mean of its divisors is an integer number (18305280).

Almost surely, 2^139708831 is an apocalyptic number.

139708831 is a deficient number, since it is larger than the sum of its proper divisors (6733409).

139708831 is a wasteful number, since it uses less digits than its factorization.

139708831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27485.

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

The square root of 139708831 is about 11819.8490261086. The cubic root of 139708831 is about 518.8891857417.

It can be divided in two parts, 13970 and 8831, that added together give a square (22801 = 151²).

The spelling of 139708831 in words is "one hundred thirty-nine million, seven hundred eight thousand, eight hundred thirty-one".