139393857 has 8 divisors (see below), whose sum is σ = 185915520. Its totient is φ = 92900720.

The previous prime is 139393853. The next prime is 139393867. The reversal of 139393857 is 758393931.

139393857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 139393857 - 2² = 139393853 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139393853) 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, 10507 + ... + 19727.

It is an arithmetic number, because the mean of its divisors is an integer number (23239440).

Almost surely, 2^139393857 is an apocalyptic number.

It is an amenable number.

139393857 is a deficient number, since it is larger than the sum of its proper divisors (46521663).

139393857 is an equidigital number, since it uses as much as digits as its factorization.

139393857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14263.

The product of its digits is 612360, while the sum is 48.

The square root of 139393857 is about 11806.5175644641. The cubic root of 139393857 is about 518.4989465610.

The spelling of 139393857 in words is "one hundred thirty-nine million, three hundred ninety-three thousand, eight hundred fifty-seven".