404740621 has 4 divisors (see below), whose sum is σ = 409864000. Its totient is φ = 399617244.

The previous prime is 404740601. The next prime is 404740631. The reversal of 404740621 is 126047404.

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 a de Polignac number, because none of the positive numbers 2^k-404740621 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 404740621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404740601) 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, 2561571 + ... + 2561728.

It is an arithmetic number, because the mean of its divisors is an integer number (102466000).

Almost surely, 2^404740621 is an apocalyptic number.

It is an amenable number.

404740621 is a deficient number, since it is larger than the sum of its proper divisors (5123379).

404740621 is an equidigital number, since it uses as much as digits as its factorization.

404740621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5123378.

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 404740621 is about 20118.1664422979. The cubic root of 404740621 is about 739.7056419954.

The spelling of 404740621 in words is "four hundred four million, seven hundred forty thousand, six hundred twenty-one".