139657 has 8 divisors (see below), whose sum is σ = 162432. Its totient is φ = 117600.

The previous prime is 139627. The next prime is 139661. The reversal of 139657 is 756931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-139657 is a prime.

It is a pancake number, because a pancake can be divided into 139657 parts by 528 straight cuts.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139627) 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, 357 + ... + 637.

It is an arithmetic number, because the mean of its divisors is an integer number (20304).

2¹³⁹⁶⁵⁷ is an apocalyptic number.

It is an amenable number.

139657 is a deficient number, since it is larger than the sum of its proper divisors (22775).

139657 is an equidigital number, since it uses as much as digits as its factorization.

139657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359.

The product of its digits is 5670, while the sum is 31.

The square root of 139657 is about 373.7071045618. The cubic root of 139657 is about 51.8825009717.

The spelling of 139657 in words is "one hundred thirty-nine thousand, six hundred fifty-seven".