138851580 has 96 divisors (see below), whose sum is σ = 470486016. Its totient is φ = 29869056.

The previous prime is 138851579. The next prime is 138851593. The reversal of 138851580 is 85158831.

138851580 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×138851580² = 38559522536992800, which contains 22 as substring.

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, 2584 + ... + 16863.

It is an arithmetic number, because the mean of its divisors is an integer number (4900896).

Almost surely, 2^138851580 is an apocalyptic number.

138851580 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 138851580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235243008).

138851580 is an abundant number, since it is smaller than the sum of its proper divisors (331634436).

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

138851580 is a wasteful number, since it uses less digits than its factorization.

138851580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19483 (or 19481 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 39.

The square root of 138851580 is about 11783.5300313616. The cubic root of 138851580 is about 517.8257092160.

The spelling of 138851580 in words is "one hundred thirty-eight million, eight hundred fifty-one thousand, five hundred eighty".