138889380 has 48 divisors (see below), whose sum is σ = 444447360. Its totient is φ = 31746048.

The previous prime is 138889369. The next prime is 138889409. The reversal of 138889380 is 83988831.

It is a happy number.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164925 + ... + 165764.

It is an arithmetic number, because the mean of its divisors is an integer number (9259320).

Almost surely, 2^138889380 is an apocalyptic number.

138889380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138889380 is an abundant number, since it is smaller than the sum of its proper divisors (305557980).

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

138889380 is a wasteful number, since it uses less digits than its factorization.

138889380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330708 (or 330706 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 48.

The square root of 138889380 is about 11785.1338558372. The cubic root of 138889380 is about 517.8726947235.

The spelling of 138889380 in words is "one hundred thirty-eight million, eight hundred eighty-nine thousand, three hundred eighty".