139397620 has 24 divisors (see below), whose sum is σ = 309955464. Its totient is φ = 52478976.

The previous prime is 139397617. The next prime is 139397647. The reversal of 139397620 is 26793931.

It can be written as a sum of positive squares in 4 ways, for example, as 1710864 + 137686756 = 1308^2 + 11734^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204657 + ... + 205336.

It is an arithmetic number, because the mean of its divisors is an integer number (12914811).

Almost surely, 2^139397620 is an apocalyptic number.

139397620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139397620 is an abundant number, since it is smaller than the sum of its proper divisors (170557844).

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

139397620 is a wasteful number, since it uses less digits than its factorization.

139397620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410019 (or 410017 counting only the distinct ones).

The product of its (nonzero) digits is 61236, while the sum is 40.

The square root of 139397620 is about 11806.6769245203. The cubic root of 139397620 is about 518.5036122233.

The spelling of 139397620 in words is "one hundred thirty-nine million, three hundred ninety-seven thousand, six hundred twenty".