3992444221 has 4 divisors (see below), whose sum is σ = 3997272672. Its totient is φ = 3987615772.

The previous prime is 3992444207. The next prime is 3992444233. The reversal of 3992444221 is 1224442993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3992444221 - 2⁹ = 3992443709 is a prime.

It is a super-2 number, since 2×3992444221² = 31879221715592593682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3992444201) 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, 2412985 + ... + 2414638.

It is an arithmetic number, because the mean of its divisors is an integer number (999318168).

Almost surely, 2^3992444221 is an apocalyptic number.

It is an amenable number.

3992444221 is a deficient number, since it is larger than the sum of its proper divisors (4828451).

3992444221 is an equidigital number, since it uses as much as digits as its factorization.

3992444221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4828450.

The product of its digits is 124416, while the sum is 40.

The square root of 3992444221 is about 63185.7912904476. The cubic root of 3992444221 is about 1586.4009176764.

The spelling of 3992444221 in words is "three billion, nine hundred ninety-two million, four hundred forty-four thousand, two hundred twenty-one".