139515857 has 8 divisors (see below), whose sum is σ = 150456936. Its totient is φ = 128604672.

The previous prime is 139515853. The next prime is 139515877. The reversal of 139515857 is 758515931.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 46566976 + 92948881 = 6824^2 + 9641^2 .

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 139515857 - 2² = 139515853 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139515853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2753 + ... + 16929.

It is an arithmetic number, because the mean of its divisors is an integer number (18807117).

Almost surely, 2^139515857 is an apocalyptic number.

It is an amenable number.

139515857 is a deficient number, since it is larger than the sum of its proper divisors (10941079).

139515857 is a wasteful number, since it uses less digits than its factorization.

139515857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14947.

The product of its digits is 189000, while the sum is 44.

The square root of 139515857 is about 11811.6830722806. The cubic root of 139515857 is about 518.6501689733.

The spelling of 139515857 in words is "one hundred thirty-nine million, five hundred fifteen thousand, eight hundred fifty-seven".