939747921 has 36 divisors (see below), whose sum is σ = 1494378576. Its totient is φ = 523763520.

The previous prime is 939747877. The next prime is 939747943. The reversal of 939747921 is 129747939.

It is not a de Polignac number, because 939747921 - 2¹³ = 939739729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (939747121) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 245206 + ... + 249008.

It is an arithmetic number, because the mean of its divisors is an integer number (41510516).

Almost surely, 2^939747921 is an apocalyptic number.

It is an amenable number.

939747921 is a deficient number, since it is larger than the sum of its proper divisors (554630655).

939747921 is a wasteful number, since it uses less digits than its factorization.

939747921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3902 (or 3854 counting only the distinct ones).

The product of its digits is 857304, while the sum is 51.

The square root of 939747921 is about 30655.3082026588. The cubic root of 939747921 is about 979.4985359626.

The spelling of 939747921 in words is "nine hundred thirty-nine million, seven hundred forty-seven thousand, nine hundred twenty-one".