139797957 has 8 divisors (see below), whose sum is σ = 200735584. Its totient is φ = 86029488.

The previous prime is 139797929. The next prime is 139797989. The reversal of 139797957 is 759797931.

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-139797957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 139797897 and 139797906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139797997) 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, 1792243 + ... + 1792320.

It is an arithmetic number, because the mean of its divisors is an integer number (25091948).

Almost surely, 2^139797957 is an apocalyptic number.

It is an amenable number.

139797957 is a deficient number, since it is larger than the sum of its proper divisors (60937627).

139797957 is a wasteful number, since it uses less digits than its factorization.

139797957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3584579.

The product of its digits is 3750705, while the sum is 57.

The square root of 139797957 is about 11823.6186085310. The cubic root of 139797957 is about 518.9995025259. Note that the first 3 decimals are identical.

The spelling of 139797957 in words is "one hundred thirty-nine million, seven hundred ninety-seven thousand, nine hundred fifty-seven".