139857993 has 24 divisors (see below), whose sum is σ = 231984480. Its totient is φ = 80300160.

The previous prime is 139857989. The next prime is 139858027. The reversal of 139857993 is 399758931.

It is not a de Polignac number, because 139857993 - 2² = 139857989 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139857943) 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, 35296 + ... + 39057.

It is an arithmetic number, because the mean of its divisors is an integer number (9666020).

Almost surely, 2^139857993 is an apocalyptic number.

It is an amenable number.

139857993 is a deficient number, since it is larger than the sum of its proper divisors (92126487).

139857993 is a wasteful number, since it uses less digits than its factorization.

139857993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74389 (or 74386 counting only the distinct ones).

The product of its digits is 1837080, while the sum is 54.

The square root of 139857993 is about 11826.1571526849. The cubic root of 139857993 is about 519.0737863841.

The spelling of 139857993 in words is "one hundred thirty-nine million, eight hundred fifty-seven thousand, nine hundred ninety-three".