404421001 has 4 divisors (see below), whose sum is σ = 404473104. Its totient is φ = 404368900.

The previous prime is 404420993. The next prime is 404421013. The reversal of 404421001 is 100124404.

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 404421001 - 2³ = 404420993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (404421301) 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, 11815 + ... + 30796.

It is an arithmetic number, because the mean of its divisors is an integer number (101118276).

Almost surely, 2^404421001 is an apocalyptic number.

It is an amenable number.

404421001 is a deficient number, since it is larger than the sum of its proper divisors (52103).

404421001 is an equidigital number, since it uses as much as digits as its factorization.

404421001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52102.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 404421001 is about 20110.2213065893. The cubic root of 404421001 is about 739.5108777715.

Adding to 404421001 its reverse (100124404), we get a palindrome (504545405).

The spelling of 404421001 in words is "four hundred four million, four hundred twenty-one thousand, one".