138889842 has 32 divisors (see below), whose sum is σ = 341884032. Its totient is φ = 36630144.

The previous prime is 138889819. The next prime is 138889843. The reversal of 138889842 is 248988831.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (138889843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126643 + ... + 127734.

It is an arithmetic number, because the mean of its divisors is an integer number (10683876).

Almost surely, 2^138889842 is an apocalyptic number.

138889842 is an abundant number, since it is smaller than the sum of its proper divisors (202994190).

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

138889842 is a wasteful number, since it uses less digits than its factorization.

138889842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254402.

The product of its digits is 884736, while the sum is 51.

The square root of 138889842 is about 11785.1534567862. The cubic root of 138889842 is about 517.8732689381.

The spelling of 138889842 in words is "one hundred thirty-eight million, eight hundred eighty-nine thousand, eight hundred forty-two".