139812973 has 16 divisors (see below), whose sum is σ = 149454000. Its totient is φ = 130540032.

The previous prime is 139812943. The next prime is 139812989. The reversal of 139812973 is 379218931.

It can be written as a sum of positive squares in 8 ways, for example, as 13520329 + 126292644 = 3677^2 + 11238^2 .

It is a cyclic number.

It is not a de Polignac number, because 139812973 - 2⁹ = 139812461 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 (139812943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 245433 + ... + 246001.

It is an arithmetic number, because the mean of its divisors is an integer number (9340875).

Almost surely, 2^139812973 is an apocalyptic number.

It is an amenable number.

139812973 is a deficient number, since it is larger than the sum of its proper divisors (9641027).

139812973 is a wasteful number, since it uses less digits than its factorization.

139812973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864.

The product of its digits is 81648, while the sum is 43.

The square root of 139812973 is about 11824.2535916649. The cubic root of 139812973 is about 519.0180841458.

The spelling of 139812973 in words is "one hundred thirty-nine million, eight hundred twelve thousand, nine hundred seventy-three".