9921442 has 8 divisors (see below), whose sum is σ = 14899500. Its totient is φ = 4954944.

The previous prime is 9921409. The next prime is 9921449. The reversal of 9921442 is 2441299.

It is a happy number.

9921442 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 2 ways, for example, as 9853321 + 68121 = 3139^2 + 261^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×9921442² = 196870022718728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9921449) 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, 267 + ... + 4462.

Almost surely, 2^9921442 is an apocalyptic number.

9921442 is a deficient number, since it is larger than the sum of its proper divisors (4978058).

9921442 is a wasteful number, since it uses less digits than its factorization.

9921442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5780.

The product of its digits is 5184, while the sum is 31.

The square root of 9921442 is about 3149.8320590152. The cubic root of 9921442 is about 214.8778249437.

The spelling of 9921442 in words is "nine million, nine hundred twenty-one thousand, four hundred forty-two".