138447180 has 36 divisors (see below), whose sum is σ = 419956992. Its totient is φ = 36919200.

The previous prime is 138447173. The next prime is 138447181. The reversal of 138447180 is 81744831.

138447180 is a `hidden beast` number, since 1 + 38 + 447 + 180 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (138447181) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 384396 + ... + 384755.

It is an arithmetic number, because the mean of its divisors is an integer number (11665472).

Almost surely, 2^138447180 is an apocalyptic number.

138447180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138447180 is an abundant number, since it is smaller than the sum of its proper divisors (281509812).

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

138447180 is a wasteful number, since it uses less digits than its factorization.

138447180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769166 (or 769161 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 138447180 is about 11766.3579751765. The cubic root of 138447180 is about 517.3225044158.

The spelling of 138447180 in words is "one hundred thirty-eight million, four hundred forty-seven thousand, one hundred eighty".