139431775 has 24 divisors (see below), whose sum is σ = 202424544. Its totient is φ = 93273600.

The previous prime is 139431767. The next prime is 139431791. The reversal of 139431775 is 577134931.

It is not a de Polignac number, because 139431775 - 2³ = 139431767 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2542 + ... + 16891.

It is an arithmetic number, because the mean of its divisors is an integer number (8434356).

Almost surely, 2^139431775 is an apocalyptic number.

139431775 is a deficient number, since it is larger than the sum of its proper divisors (62992769).

139431775 is a wasteful number, since it uses less digits than its factorization.

139431775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19491 (or 19486 counting only the distinct ones).

The product of its digits is 79380, while the sum is 40.

The square root of 139431775 is about 11808.1232632455. The cubic root of 139431775 is about 518.5459564295.

The spelling of 139431775 in words is "one hundred thirty-nine million, four hundred thirty-one thousand, seven hundred seventy-five".