138480880 has 40 divisors (see below), whose sum is σ = 323416800. Its totient is φ = 55143168.

The previous prime is 138480877. The next prime is 138480961. The reversal of 138480880 is 88084831.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14541 + ... + 22099.

It is an arithmetic number, because the mean of its divisors is an integer number (8085420).

Almost surely, 2^138480880 is an apocalyptic number.

138480880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138480880 is an abundant number, since it is smaller than the sum of its proper divisors (184935920).

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

138480880 is a wasteful number, since it uses less digits than its factorization.

138480880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7801 (or 7795 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 40.

The square root of 138480880 is about 11767.7899369423. The cubic root of 138480880 is about 517.3644755464.

The spelling of 138480880 in words is "one hundred thirty-eight million, four hundred eighty thousand, eight hundred eighty".