9921426 has 32 divisors (see below), whose sum is σ = 20998656. Its totient is φ = 3120000.

The previous prime is 9921409. The next prime is 9921449. The reversal of 9921426 is 6241299.

9921426 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6976 + ... + 8276.

It is an arithmetic number, because the mean of its divisors is an integer number (656208).

Almost surely, 2^9921426 is an apocalyptic number.

9921426 is an abundant number, since it is smaller than the sum of its proper divisors (11077230).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9921426 is a wasteful number, since it uses less digits than its factorization.

9921426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1378.

The product of its digits is 7776, while the sum is 33.

The square root of 9921426 is about 3149.8295191962. The cubic root of 9921426 is about 214.8777094348.

The spelling of 9921426 in words is "nine million, nine hundred twenty-one thousand, four hundred twenty-six".