138331880 has 16 divisors (see below), whose sum is σ = 311246820. Its totient is φ = 55332736.

The previous prime is 138331859. The next prime is 138331883. The reversal of 138331880 is 88133831.

138331880 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 132388036 + 5943844 = 11506^2 + 2438^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 138331880.

It is not an unprimeable number, because it can be changed into a prime (138331883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1729109 + ... + 1729188.

Almost surely, 2^138331880 is an apocalyptic number.

138331880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138331880 is an abundant number, since it is smaller than the sum of its proper divisors (172914940).

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

138331880 is a wasteful number, since it uses less digits than its factorization.

138331880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3458308 (or 3458304 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 138331880 is about 11761.4573926874. The cubic root of 138331880 is about 517.1788543232.

The spelling of 138331880 in words is "one hundred thirty-eight million, three hundred thirty-one thousand, eight hundred eighty".