202138885 has 8 divisors (see below), whose sum is σ = 261225720. Its totient is φ = 149271744.

The previous prime is 202138841. The next prime is 202138889. The reversal of 202138885 is 588831202.

It can be written as a sum of positive squares in 4 ways, for example, as 3272481 + 198866404 = 1809^2 + 14102^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 202138885 - 2⁷ = 202138757 is a prime.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1554850 + ... + 1554979.

It is an arithmetic number, because the mean of its divisors is an integer number (32653215).

Almost surely, 2^202138885 is an apocalyptic number.

It is an amenable number.

202138885 is a deficient number, since it is larger than the sum of its proper divisors (59086835).

202138885 is a wasteful number, since it uses less digits than its factorization.

202138885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3109847.

The product of its (nonzero) digits is 30720, while the sum is 37.

The square root of 202138885 is about 14217.5555212561. Note that the first 4 decimals coincide. The cubic root of 202138885 is about 586.8808724432.

The spelling of 202138885 in words is "two hundred two million, one hundred thirty-eight thousand, eight hundred eighty-five".