138989814 has 12 divisors (see below), whose sum is σ = 278037396. Its totient is φ = 46320312.

The previous prime is 138989789. The next prime is 138989819. The reversal of 138989814 is 418989831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138989819) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26472 + ... + 31284.

It is an arithmetic number, because the mean of its divisors is an integer number (23169783).

Almost surely, 2^138989814 is an apocalyptic number.

138989814 is an abundant number, since it is smaller than the sum of its proper divisors (139047582).

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

138989814 is an frugal number, since it uses more digits than its factorization.

138989814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9631 (or 4818 counting only the distinct ones).

The product of its digits is 497664, while the sum is 51.

The square root of 138989814 is about 11789.3941320154. The cubic root of 138989814 is about 517.9974930684.

Multiplying 138989814 by its product of digits (497664), we get a square (69170226794496 = 8316864²).

The spelling of 138989814 in words is "one hundred thirty-eight million, nine hundred eighty-nine thousand, eight hundred fourteen".