139931790 has 16 divisors (see below), whose sum is σ = 335836368. Its totient is φ = 37315136.

The previous prime is 139931773. The next prime is 139931797. The reversal of 139931790 is 97139931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139931797) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2332167 + ... + 2332226.

It is an arithmetic number, because the mean of its divisors is an integer number (20989773).

Almost surely, 2^139931790 is an apocalyptic number.

139931790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

139931790 is an abundant number, since it is smaller than the sum of its proper divisors (195904578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139931790 is a wasteful number, since it uses less digits than its factorization.

139931790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4664403.

The product of its (nonzero) digits is 45927, while the sum is 42.

The square root of 139931790 is about 11829.2768164415. The cubic root of 139931790 is about 519.1650679092.

The spelling of 139931790 in words is "one hundred thirty-nine million, nine hundred thirty-one thousand, seven hundred ninety".