138876721460 has 24 divisors (see below), whose sum is σ = 292725294120. Its totient is φ = 55344178304.

The previous prime is 138876721433. The next prime is 138876721463. The reversal of 138876721460 is 64127678831.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 14291724304 + 124584997156 = 119548^2 + 352966^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138876721463) 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, 12901379 + ... + 12912138.

It is an arithmetic number, because the mean of its divisors is an integer number (12196887255).

Almost surely, 2^138876721460 is an apocalyptic number.

138876721460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138876721460 is an abundant number, since it is smaller than the sum of its proper divisors (153848572660).

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

138876721460 is a wasteful number, since it uses less digits than its factorization.

138876721460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25813795 (or 25813793 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 53.

The spelling of 138876721460 in words is "one hundred thirty-eight billion, eight hundred seventy-six million, seven hundred twenty-one thousand, four hundred sixty".