404421621 has 8 divisors (see below), whose sum is σ = 540000864. Its totient is φ = 269228400.

The previous prime is 404421541. The next prime is 404421623. The reversal of 404421621 is 126124404.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 404421621 - 2¹⁴ = 404405237 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 404421591 and 404421600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404421623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94051 + ... + 98256.

It is an arithmetic number, because the mean of its divisors is an integer number (67500108).

Almost surely, 2^404421621 is an apocalyptic number.

It is an amenable number.

404421621 is a deficient number, since it is larger than the sum of its proper divisors (135579243).

404421621 is a wasteful number, since it uses less digits than its factorization.

404421621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193011.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 404421621 is about 20110.2367216301. The cubic root of 404421621 is about 739.5112556751.

The spelling of 404421621 in words is "four hundred four million, four hundred twenty-one thousand, six hundred twenty-one".