139631689 has 8 divisors (see below), whose sum is σ = 148803840. Its totient is φ = 130718016.

The previous prime is 139631669. The next prime is 139631717. The reversal of 139631689 is 986136931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-139631689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139631629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63504 + ... + 65665.

It is an arithmetic number, because the mean of its divisors is an integer number (18600480).

Almost surely, 2^139631689 is an apocalyptic number.

It is an amenable number.

139631689 is a deficient number, since it is larger than the sum of its proper divisors (9172151).

139631689 is a wasteful number, since it uses less digits than its factorization.

139631689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129239.

The product of its digits is 209952, while the sum is 46.

The square root of 139631689 is about 11816.5853358743. The cubic root of 139631689 is about 518.7936644138.

The spelling of 139631689 in words is "one hundred thirty-nine million, six hundred thirty-one thousand, six hundred eighty-nine".