202138839 has 24 divisors (see below), whose sum is σ = 336940032. Its totient is φ = 114382800.

The previous prime is 202138813. The next prime is 202138841. The reversal of 202138839 is 938831202.

It is a happy number.

It is not a de Polignac number, because 202138839 - 2¹⁵ = 202106071 is a prime.

It is a super-2 number, since 2×202138839² = 81720220464535842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202138889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9087 + ... + 22064.

It is an arithmetic number, because the mean of its divisors is an integer number (14039168).

Almost surely, 2^202138839 is an apocalyptic number.

202138839 is a deficient number, since it is larger than the sum of its proper divisors (134801193).

202138839 is a wasteful number, since it uses less digits than its factorization.

202138839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31267 (or 31264 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 202138839 is about 14217.5539035377. The cubic root of 202138839 is about 586.8808279251.

The spelling of 202138839 in words is "two hundred two million, one hundred thirty-eight thousand, eight hundred thirty-nine".