3984492221 has 4 divisors (see below), whose sum is σ = 4000366944. Its totient is φ = 3968617500.

The previous prime is 3984492179. The next prime is 3984492227. The reversal of 3984492221 is 1222944893.

It is a happy number.

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 3984492221 - 2²⁶ = 3917383357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3984492227) 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, 7936985 + ... + 7937486.

It is an arithmetic number, because the mean of its divisors is an integer number (1000091736).

Almost surely, 2^3984492221 is an apocalyptic number.

It is an amenable number.

3984492221 is a deficient number, since it is larger than the sum of its proper divisors (15874723).

3984492221 is a wasteful number, since it uses less digits than its factorization.

3984492221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15874722.

The product of its digits is 248832, while the sum is 44.

The square root of 3984492221 is about 63122.8343866148. The cubic root of 3984492221 is about 1585.3469731018.

The spelling of 3984492221 in words is "three billion, nine hundred eighty-four million, four hundred ninety-two thousand, two hundred twenty-one".