404221155 has 32 divisors (see below), whose sum is σ = 737481024. Its totient is φ = 187293696.

The previous prime is 404221123. The next prime is 404221157. The reversal of 404221155 is 551122404.

It is not a de Polignac number, because 404221155 - 2⁵ = 404221123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (404221157) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57654 + ... + 64283.

It is an arithmetic number, because the mean of its divisors is an integer number (23046282).

Almost surely, 2^404221155 is an apocalyptic number.

404221155 is a deficient number, since it is larger than the sum of its proper divisors (333259869).

404221155 is a wasteful number, since it uses less digits than its factorization.

404221155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121975.

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 404221155 is about 20105.2519258029. The cubic root of 404221155 is about 739.3890471045.

Adding to 404221155 its reverse (551122404), we get a palindrome (955343559).

The spelling of 404221155 in words is "four hundred four million, two hundred twenty-one thousand, one hundred fifty-five".