404442331 has 4 divisors (see below), whose sum is σ = 404483112. Its totient is φ = 404401552.

The previous prime is 404442289. The next prime is 404442343. The reversal of 404442331 is 133244404.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 404442331 - 2²¹ = 402345179 is a prime.

It is a super-2 number, since 2×404442331² = 327147198209427122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 404442296 and 404442305.

It is not an unprimeable number, because it can be changed into a prime (404442931) 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, 5151 + ... + 28903.

It is an arithmetic number, because the mean of its divisors is an integer number (101120778).

Almost surely, 2^404442331 is an apocalyptic number.

404442331 is a deficient number, since it is larger than the sum of its proper divisors (40781).

404442331 is a wasteful number, since it uses less digits than its factorization.

404442331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40780.

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 404442331 is about 20110.7516269283. The cubic root of 404442331 is about 739.5238786540.

Adding to 404442331 its reverse (133244404), we get a palindrome (537686735).

The spelling of 404442331 in words is "four hundred four million, four hundred forty-two thousand, three hundred thirty-one".