404621979 has 4 divisors (see below), whose sum is σ = 539495976. Its totient is φ = 269747984.

The previous prime is 404621969. The next prime is 404621993. The reversal of 404621979 is 979126404.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 404621979 - 2¹¹ = 404619931 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 404621979.

It is not an unprimeable number, because it can be changed into a prime (404621969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67436994 + ... + 67436999.

It is an arithmetic number, because the mean of its divisors is an integer number (134873994).

Almost surely, 2^404621979 is an apocalyptic number.

404621979 is a deficient number, since it is larger than the sum of its proper divisors (134873997).

404621979 is a wasteful number, since it uses less digits than its factorization.

404621979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134873996.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 404621979 is about 20115.2175976299. The cubic root of 404621979 is about 739.6333580612.

The spelling of 404621979 in words is "four hundred four million, six hundred twenty-one thousand, nine hundred seventy-nine".