404031289 has 2 divisors, whose sum is σ = 404031290. Its totient is φ = 404031288.

The previous prime is 404031247. The next prime is 404031319. The reversal of 404031289 is 982130404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 341621289 + 62410000 = 18483^2 + 7900^2 .

It is a cyclic number.

It is not a de Polignac number, because 404031289 - 2⁹ = 404030777 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 404031289.

It is not a weakly prime, because it can be changed into another prime (404031389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202015644 + 202015645.

It is an arithmetic number, because the mean of its divisors is an integer number (202015645).

Almost surely, 2^404031289 is an apocalyptic number.

It is an amenable number.

404031289 is a deficient number, since it is larger than the sum of its proper divisors (1).

404031289 is an equidigital number, since it uses as much as digits as its factorization.

404031289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 404031289 is about 20100.5295701382. The cubic root of 404031289 is about 739.2732632695.

The spelling of 404031289 in words is "four hundred four million, thirty-one thousand, two hundred eighty-nine".