139631690 has 16 divisors (see below), whose sum is σ = 274186080. Its totient is φ = 50775120.

The previous prime is 139631669. The next prime is 139631717. The reversal of 139631690 is 96136931.

It is a super-2 number, since 2×139631690² = 38994017704512200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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, 634580 + ... + 634799.

It is an arithmetic number, because the mean of its divisors is an integer number (17136630).

Almost surely, 2^139631690 is an apocalyptic number.

139631690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

139631690 is a deficient number, since it is larger than the sum of its proper divisors (134554390).

139631690 is a wasteful number, since it uses less digits than its factorization.

139631690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1269397.

The product of its (nonzero) digits is 26244, while the sum is 38.

The square root of 139631690 is about 11816.5853781877. The cubic root of 139631690 is about 518.7936656523.

The spelling of 139631690 in words is "one hundred thirty-nine million, six hundred thirty-one thousand, six hundred ninety".