139690557 has 24 divisors (see below), whose sum is σ = 210349568. Its totient is φ = 89229600.

The previous prime is 139690541. The next prime is 139690561. The reversal of 139690557 is 755096931.

139690557 is a `hidden beast` number, since 1 + 3 + 9 + 6 + 90 + 557 = 666.

It is not a de Polignac number, because 139690557 - 2⁴ = 139690541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139690597) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26307 + ... + 31167.

Almost surely, 2^139690557 is an apocalyptic number.

It is an amenable number.

139690557 is a deficient number, since it is larger than the sum of its proper divisors (70659011).

139690557 is a wasteful number, since it uses less digits than its factorization.

139690557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5001 (or 4998 counting only the distinct ones).

The product of its (nonzero) digits is 255150, while the sum is 45.

The square root of 139690557 is about 11819.0759791111. The cubic root of 139690557 is about 518.8665610816.

The spelling of 139690557 in words is "one hundred thirty-nine million, six hundred ninety thousand, five hundred fifty-seven".