138802889 has 4 divisors (see below), whose sum is σ = 140076420. Its totient is φ = 137529360.

The previous prime is 138802883. The next prime is 138802901. The reversal of 138802889 is 988208831.

138802889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 79512889 + 59290000 = 8917^2 + 7700^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138802889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138802883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 636602 + ... + 636819.

It is an arithmetic number, because the mean of its divisors is an integer number (35019105).

Almost surely, 2^138802889 is an apocalyptic number.

It is an amenable number.

138802889 is a deficient number, since it is larger than the sum of its proper divisors (1273531).

138802889 is a wasteful number, since it uses less digits than its factorization.

138802889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1273530.

The product of its (nonzero) digits is 221184, while the sum is 47.

The square root of 138802889 is about 11781.4637885112. The cubic root of 138802889 is about 517.7651735962.

The spelling of 138802889 in words is "one hundred thirty-eight million, eight hundred two thousand, eight hundred eighty-nine".