396744221 has 4 divisors (see below), whose sum is σ = 396912000. Its totient is φ = 396576444.

The previous prime is 396744211. The next prime is 396744251. The reversal of 396744221 is 122447693.

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 396744221 - 2²² = 392549917 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 (396744211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80291 + ... + 85088.

It is an arithmetic number, because the mean of its divisors is an integer number (99228000).

Almost surely, 2^396744221 is an apocalyptic number.

It is an amenable number.

396744221 is a deficient number, since it is larger than the sum of its proper divisors (167779).

396744221 is a wasteful number, since it uses less digits than its factorization.

396744221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167778.

The product of its digits is 72576, while the sum is 38.

The square root of 396744221 is about 19918.4392209832. The cubic root of 396744221 is about 734.8017859077.

The spelling of 396744221 in words is "three hundred ninety-six million, seven hundred forty-four thousand, two hundred twenty-one".