938860821 has 16 divisors (see below), whose sum is σ = 1413709120. Its totient is φ = 615645360.

The previous prime is 938860817. The next prime is 938860843. The reversal of 938860821 is 128068839.

938860821 is a `hidden beast` number, since 9 + 38 + 8 + 608 + 2 + 1 = 666.

It is not a de Polignac number, because 938860821 - 2² = 938860817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (938860121) 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, 283375 + ... + 286668.

It is an arithmetic number, because the mean of its divisors is an integer number (88356820).

Almost surely, 2^938860821 is an apocalyptic number.

It is an amenable number.

938860821 is a deficient number, since it is larger than the sum of its proper divisors (474848299).

938860821 is a wasteful number, since it uses less digits than its factorization.

938860821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570113 (or 570107 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 938860821 is about 30640.8358404271. The cubic root of 938860821 is about 979.1902310486.

The spelling of 938860821 in words is "nine hundred thirty-eight million, eight hundred sixty thousand, eight hundred twenty-one".