138605380 has 24 divisors (see below), whose sum is σ = 306391680. Its totient is φ = 52524000.

The previous prime is 138605377. The next prime is 138605417. The reversal of 138605380 is 83506831.

It is a happy number.

It is a super-2 number, since 2×138605380² = 38422902729888800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181996 + ... + 182755.

It is an arithmetic number, because the mean of its divisors is an integer number (12766320).

Almost surely, 2^138605380 is an apocalyptic number.

138605380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138605380 is an abundant number, since it is smaller than the sum of its proper divisors (167786300).

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

138605380 is a wasteful number, since it uses less digits than its factorization.

138605380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364779 (or 364777 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 138605380 is about 11773.0786118160. The cubic root of 138605380 is about 517.5194730784.

The spelling of 138605380 in words is "one hundred thirty-eight million, six hundred five thousand, three hundred eighty".