139535857 has 4 divisors (see below), whose sum is σ = 139572720. Its totient is φ = 139498996.

The previous prime is 139535839. The next prime is 139535863. The reversal of 139535857 is 758535931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 139535857 - 2⁷ = 139535729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139535897) 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, 12007 + ... + 20572.

It is an arithmetic number, because the mean of its divisors is an integer number (34893180).

Almost surely, 2^139535857 is an apocalyptic number.

It is an amenable number.

139535857 is a deficient number, since it is larger than the sum of its proper divisors (36863).

139535857 is an equidigital number, since it uses as much as digits as its factorization.

139535857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36862.

The product of its digits is 567000, while the sum is 46.

The square root of 139535857 is about 11812.5296613384. The cubic root of 139535857 is about 518.6749511210.

The spelling of 139535857 in words is "one hundred thirty-nine million, five hundred thirty-five thousand, eight hundred fifty-seven".