139391461020 has 96 divisors (see below), whose sum is σ = 446157992448. Its totient is φ = 31853382912.

The previous prime is 139391460953. The next prime is 139391461093. The reversal of 139391461020 is 20164193931.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 139391461020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1850127 + ... + 1923993.

It is an arithmetic number, because the mean of its divisors is an integer number (4647479088).

Almost surely, 2^139391461020 is an apocalyptic number.

139391461020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139391461020 is an abundant number, since it is smaller than the sum of its proper divisors (306766531428).

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

139391461020 is a wasteful number, since it uses less digits than its factorization.

139391461020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78379 (or 78377 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 39.

The spelling of 139391461020 in words is "one hundred thirty-nine billion, three hundred ninety-one million, four hundred sixty-one thousand, twenty".