396423621 has 12 divisors (see below), whose sum is σ = 624667680. Its totient is φ = 240256680.

The previous prime is 396423617. The next prime is 396423631. The reversal of 396423621 is 126324693.

396423621 is a `hidden beast` number, since 3 + 9 + 6 + 4 + 23 + 621 = 666.

It is not a de Polignac number, because 396423621 - 2² = 396423617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396423631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2002041 + ... + 2002238.

It is an arithmetic number, because the mean of its divisors is an integer number (52055640).

Almost surely, 2^396423621 is an apocalyptic number.

It is an amenable number.

396423621 is a deficient number, since it is larger than the sum of its proper divisors (228244059).

396423621 is a wasteful number, since it uses less digits than its factorization.

396423621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4004296 (or 4004293 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

The square root of 396423621 is about 19910.3897751902. The cubic root of 396423621 is about 734.6038070223.

The spelling of 396423621 in words is "three hundred ninety-six million, four hundred twenty-three thousand, six hundred twenty-one".