9921764 has 6 divisors (see below), whose sum is σ = 17363094. Its totient is φ = 4960880.

The previous prime is 9921733. The next prime is 9921797. The reversal of 9921764 is 4671299.

9921764 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 6150400 + 3771364 = 2480^2 + 1942^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1240217 + ... + 1240224.

It is an arithmetic number, because the mean of its divisors is an integer number (2893849).

Almost surely, 2^9921764 is an apocalyptic number.

It is an amenable number.

9921764 is a deficient number, since it is larger than the sum of its proper divisors (7441330).

9921764 is a wasteful number, since it uses less digits than its factorization.

9921764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2480445 (or 2480443 counting only the distinct ones).

The product of its digits is 27216, while the sum is 38.

The square root of 9921764 is about 3149.8831724367. The cubic root of 9921764 is about 214.8801495356.

The spelling of 9921764 in words is "nine million, nine hundred twenty-one thousand, seven hundred sixty-four".