404442031 has 6 divisors (see below), whose sum is σ = 470473440. Its totient is φ = 346664556.

The previous prime is 404442013. The next prime is 404442187. The reversal of 404442031 is 130244404.

It is not a de Polignac number, because 404442031 - 2²¹ = 402344879 is a prime.

It is a super-2 number, since 2×404442031² = 327146712878809922, 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 = 404441993 and 404442011.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 4126911 + ... + 4127008.

It is an arithmetic number, because the mean of its divisors is an integer number (78412240).

Almost surely, 2^404442031 is an apocalyptic number.

404442031 is a deficient number, since it is larger than the sum of its proper divisors (66031409).

404442031 is an equidigital number, since it uses as much as digits as its factorization.

404442031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8253933 (or 8253926 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 404442031 is about 20110.7441682301. The cubic root of 404442031 is about 739.5236958036.

Adding to 404442031 its reverse (130244404), we get a palindrome (534686435).

The spelling of 404442031 in words is "four hundred four million, four hundred forty-two thousand, thirty-one".