138440080 has 40 divisors (see below), whose sum is σ = 338817600. Its totient is φ = 52460928.

The previous prime is 138440077. The next prime is 138440083. The reversal of 138440080 is 80044831.

It is an interprime number because it is at equal distance from previous prime (138440077) and next prime (138440083).

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

It is not an unprimeable number, because it can be changed into a prime (138440083) 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, 44020 + ... + 47059.

It is an arithmetic number, because the mean of its divisors is an integer number (8470440).

Almost surely, 2^138440080 is an apocalyptic number.

138440080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138440080 is an abundant number, since it is smaller than the sum of its proper divisors (200377520).

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

138440080 is a wasteful number, since it uses less digits than its factorization.

138440080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91111 (or 91105 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 138440080 is about 11766.0562636765. The cubic root of 138440080 is about 517.3136609647.

The spelling of 138440080 in words is "one hundred thirty-eight million, four hundred forty thousand, eighty".