139717257 has 4 divisors (see below), whose sum is σ = 186289680. Its totient is φ = 93144836.

The previous prime is 139717199. The next prime is 139717297. The reversal of 139717257 is 752717931.

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 a de Polignac number, because none of the positive numbers 2^k-139717257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139717297) 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 3 ways as a sum of consecutive naturals, for example, 23286207 + ... + 23286212.

It is an arithmetic number, because the mean of its divisors is an integer number (46572420).

Almost surely, 2^139717257 is an apocalyptic number.

It is an amenable number.

139717257 is a deficient number, since it is larger than the sum of its proper divisors (46572423).

139717257 is an equidigital number, since it uses as much as digits as its factorization.

139717257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46572422.

The product of its digits is 92610, while the sum is 42.

The square root of 139717257 is about 11820.2054550672. The cubic root of 139717257 is about 518.8996171328.

The spelling of 139717257 in words is "one hundred thirty-nine million, seven hundred seventeen thousand, two hundred fifty-seven".