137991020 has 12 divisors (see below), whose sum is σ = 289781184. Its totient is φ = 55196400.

The previous prime is 137991017. The next prime is 137991043. The reversal of 137991020 is 20199731.

It is a happy number.

137991020 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 3 ways as a sum of consecutive naturals, for example, 3449756 + ... + 3449795.

It is an arithmetic number, because the mean of its divisors is an integer number (24148432).

Almost surely, 2^137991020 is an apocalyptic number.

137991020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

137991020 is an abundant number, since it is smaller than the sum of its proper divisors (151790164).

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

137991020 is a wasteful number, since it uses less digits than its factorization.

137991020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6899560 (or 6899558 counting only the distinct ones).

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 137991020 is about 11746.9579040703. The cubic root of 137991020 is about 516.7537159376.

The spelling of 137991020 in words is "one hundred thirty-seven million, nine hundred ninety-one thousand, twenty".