130139920 has 20 divisors (see below), whose sum is σ = 302575500. Its totient is φ = 52055936.

The previous prime is 130139909. The next prime is 130139923. The reversal of 130139920 is 29931031.

It can be written as a sum of positive squares in 2 ways, for example, as 63489024 + 66650896 = 7968^2 + 8164^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (130139923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 813295 + ... + 813454.

It is an arithmetic number, because the mean of its divisors is an integer number (15128775).

Almost surely, 2^130139920 is an apocalyptic number.

130139920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

130139920 is an abundant number, since it is smaller than the sum of its proper divisors (172435580).

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

130139920 is a wasteful number, since it uses less digits than its factorization.

130139920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1626762 (or 1626756 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 130139920 is about 11407.8884987538. Note that the first 3 decimals coincide. The cubic root of 130139920 is about 506.7613819544.

The spelling of 130139920 in words is "one hundred thirty million, one hundred thirty-nine thousand, nine hundred twenty".