138120080 has 40 divisors (see below), whose sum is σ = 367006272. Its totient is φ = 47355264.

The previous prime is 138120077. The next prime is 138120089. The reversal of 138120080 is 80021831.

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 (138120089) 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, 122762 + ... + 123881.

Almost surely, 2^138120080 is an apocalyptic number.

138120080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138120080 is an abundant number, since it is smaller than the sum of its proper divisors (228886192).

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

138120080 is a wasteful number, since it uses less digits than its factorization.

138120080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246663 (or 246657 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 138120080 is about 11752.4499573493. The cubic root of 138120080 is about 516.9147685758.

The spelling of 138120080 in words is "one hundred thirty-eight million, one hundred twenty thousand, eighty".