404672621 has 4 divisors (see below), whose sum is σ = 425971200. Its totient is φ = 383374044.

The previous prime is 404672599. The next prime is 404672657. The reversal of 404672621 is 126276404.

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 404672621 - 2¹⁸ = 404410477 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 (404672221) 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, 10649261 + ... + 10649298.

It is an arithmetic number, because the mean of its divisors is an integer number (106492800).

Almost surely, 2^404672621 is an apocalyptic number.

It is an amenable number.

404672621 is a deficient number, since it is larger than the sum of its proper divisors (21298579).

404672621 is a wasteful number, since it uses less digits than its factorization.

404672621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21298578.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 404672621 is about 20116.4763564596. The cubic root of 404672621 is about 739.6642139809.

It can be divided in two parts, 4046 and 72621, that added together give a palindrome (76667).

The spelling of 404672621 in words is "four hundred four million, six hundred seventy-two thousand, six hundred twenty-one".