9921404 has 12 divisors (see below), whose sum is σ = 18383904. Its totient is φ = 4668864.

The previous prime is 9921391. The next prime is 9921407. The reversal of 9921404 is 4041299.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9921407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72884 + ... + 73019.

It is an arithmetic number, because the mean of its divisors is an integer number (1531992).

Almost surely, 2^9921404 is an apocalyptic number.

It is an amenable number.

9921404 is a deficient number, since it is larger than the sum of its proper divisors (8462500).

9921404 is a wasteful number, since it uses less digits than its factorization.

9921404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145924 (or 145922 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 9921404 is about 3149.8260269418. The cubic root of 9921404 is about 214.8775506097.

The spelling of 9921404 in words is "nine million, nine hundred twenty-one thousand, four hundred four".