404005031 has 2 divisors, whose sum is σ = 404005032. Its totient is φ = 404005030.

The previous prime is 404005027. The next prime is 404005033. The reversal of 404005031 is 130500404.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 404005031 - 2² = 404005027 is a prime.

It is a super-2 number, since 2×404005031² = 326440130146621922, which contains 22 as substring.

Together with 404005033, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404005033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202002515 + 202002516.

It is an arithmetic number, because the mean of its divisors is an integer number (202002516).

Almost surely, 2^404005031 is an apocalyptic number.

404005031 is a deficient number, since it is larger than the sum of its proper divisors (1).

404005031 is an equidigital number, since it uses as much as digits as its factorization.

404005031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 404005031 is about 20099.8763926548. The cubic root of 404005031 is about 739.2572477954.

Adding to 404005031 its reverse (130500404), we get a palindrome (534505435).

The spelling of 404005031 in words is "four hundred four million, five thousand, thirty-one".