138698880 has 256 divisors, whose sum is σ = 475891200. Its totient is φ = 34291712.

The previous prime is 138698863. The next prime is 138698881. The reversal of 138698880 is 88896831.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (138698881) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2616934 + ... + 2616986.

It is an arithmetic number, because the mean of its divisors is an integer number (1858950).

Almost surely, 2^138698880 is an apocalyptic number.

138698880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138698880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (237945600).

138698880 is an abundant number, since it is smaller than the sum of its proper divisors (337192320).

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

138698880 is a wasteful number, since it uses less digits than its factorization.

138698880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151 (or 139 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 51.

The square root of 138698880 is about 11777.0488663332. The cubic root of 138698880 is about 517.6358158310.

The spelling of 138698880 in words is "one hundred thirty-eight million, six hundred ninety-eight thousand, eight hundred eighty".