139595985 has 24 divisors (see below), whose sum is σ = 242260200. Its totient is φ = 74360832.

The previous prime is 139595977. The next prime is 139596031. The reversal of 139595985 is 589595931.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 31102929 + 108493056 = 5577^2 + 10416^2 .

It is not a de Polignac number, because 139595985 - 2³ = 139595977 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53491 + ... + 56039.

It is an arithmetic number, because the mean of its divisors is an integer number (10094175).

Almost surely, 2^139595985 is an apocalyptic number.

139595985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

139595985 is a deficient number, since it is larger than the sum of its proper divisors (102664215).

139595985 is a wasteful number, since it uses less digits than its factorization.

139595985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3777 (or 3774 counting only the distinct ones).

The product of its digits is 2187000, while the sum is 54.

The square root of 139595985 is about 11815.0744813564. The cubic root of 139595985 is about 518.7494419116.

Subtracting from 139595985 its sum of digits (54), we obtain a palindrome (139595931).

The spelling of 139595985 in words is "one hundred thirty-nine million, five hundred ninety-five thousand, nine hundred eighty-five".