404404387 has 2 divisors, whose sum is σ = 404404388. Its totient is φ = 404404386.

The previous prime is 404404369. The next prime is 404404411. The reversal of 404404387 is 783404404.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 404404387 - 2¹⁵ = 404371619 is a prime.

It is not a weakly prime, because it can be changed into another prime (404404337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202202193 + 202202194.

It is an arithmetic number, because the mean of its divisors is an integer number (202202194).

Almost surely, 2^404404387 is an apocalyptic number.

404404387 is a deficient number, since it is larger than the sum of its proper divisors (1).

404404387 is an equidigital number, since it uses as much as digits as its factorization.

404404387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43008, while the sum is 34.

The square root of 404404387 is about 20109.8082288221. The cubic root of 404404387 is about 739.5007510290.

The spelling of 404404387 in words is "four hundred four million, four hundred four thousand, three hundred eighty-seven".