139191657 has 8 divisors (see below), whose sum is σ = 202460640. Its totient is φ = 84358560.

The previous prime is 139191641. The next prime is 139191667. The reversal of 139191657 is 756191931.

139191657 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 not a de Polignac number, because 139191657 - 2⁴ = 139191641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139191617) 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, 2108932 + ... + 2108997.

It is an arithmetic number, because the mean of its divisors is an integer number (25307580).

Almost surely, 2^139191657 is an apocalyptic number.

It is an amenable number.

139191657 is a deficient number, since it is larger than the sum of its proper divisors (63268983).

139191657 is a wasteful number, since it uses less digits than its factorization.

139191657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4217943.

The product of its digits is 51030, while the sum is 42.

The square root of 139191657 is about 11797.9513899660. The cubic root of 139191657 is about 518.2481195809.

It can be divided in two parts, 13919 and 1657, that added together give a triangular number (15576 = T₁₇₆).

The spelling of 139191657 in words is "one hundred thirty-nine million, one hundred ninety-one thousand, six hundred fifty-seven".