139857 has 4 divisors (see below), whose sum is σ = 186480. Its totient is φ = 93236.

The previous prime is 139837. The next prime is 139861. The reversal of 139857 is 758931.

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 139857 - 2⁷ = 139729 is a prime.

It is a D-number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139857.

It is not an unprimeable number, because it can be changed into a prime (139837) 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, 23307 + ... + 23312.

It is an arithmetic number, because the mean of its divisors is an integer number (46620).

2¹³⁹⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

139857 is a deficient number, since it is larger than the sum of its proper divisors (46623).

139857 is an equidigital number, since it uses as much as digits as its factorization.

139857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46622.

The product of its digits is 7560, while the sum is 33.

The square root of 139857 is about 373.9745980678. The cubic root of 139857 is about 51.9072557896.

It can be divided in two parts, 13 and 9857, that added together give a triangular number (9870 = T₁₄₀).

The spelling of 139857 in words is "one hundred thirty-nine thousand, eight hundred fifty-seven".