139982957 has 6 divisors (see below), whose sum is σ = 140500782. Its totient is φ = 139466712.

The previous prime is 139982939. The next prime is 139982977. The reversal of 139982957 is 759289931.

It can be written as a sum of positive squares in only one way, i.e., 103754596 + 36228361 = 10186^2 + 6019^2 .

It is not a de Polignac number, because 139982957 - 2²⁰ = 138934381 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 139982899 and 139982908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139982917) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 214043 + ... + 214695.

It is an arithmetic number, because the mean of its divisors is an integer number (23416797).

Almost surely, 2^139982957 is an apocalyptic number.

It is an amenable number.

139982957 is a deficient number, since it is larger than the sum of its proper divisors (517825).

139982957 is an frugal number, since it uses more digits than its factorization.

139982957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1579 (or 1116 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 53.

The square root of 139982957 is about 11831.4393460813. The cubic root of 139982957 is about 519.2283389308.

The spelling of 139982957 in words is "one hundred thirty-nine million, nine hundred eighty-two thousand, nine hundred fifty-seven".