404990389 has 2 divisors, whose sum is σ = 404990390. Its totient is φ = 404990388.

The previous prime is 404990363. The next prime is 404990441. The reversal of 404990389 is 983099404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 340107364 + 64883025 = 18442^2 + 8055^2 .

It is a cyclic number.

It is not a de Polignac number, because 404990389 - 2¹¹ = 404988341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404990329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202495194 + 202495195.

It is an arithmetic number, because the mean of its divisors is an integer number (202495195).

Almost surely, 2^404990389 is an apocalyptic number.

It is an amenable number.

404990389 is a deficient number, since it is larger than the sum of its proper divisors (1).

404990389 is an equidigital number, since it uses as much as digits as its factorization.

404990389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 404990389 is about 20124.3730088666. The cubic root of 404990389 is about 739.8577697185.

The spelling of 404990389 in words is "four hundred four million, nine hundred ninety thousand, three hundred eighty-nine".