404099989 has 2 divisors, whose sum is σ = 404099990. Its totient is φ = 404099988.

The previous prime is 404099959. The next prime is 404100001. The reversal of 404099989 is 989990404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 320231025 + 83868964 = 17895^2 + 9158^2 .

It is a cyclic number.

It is not a de Polignac number, because 404099989 - 2⁵ = 404099957 is a prime.

It is a super-2 number, since 2×404099989² = 326593602219600242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404099959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202049994 + 202049995.

It is an arithmetic number, because the mean of its divisors is an integer number (202049995).

Almost surely, 2^404099989 is an apocalyptic number.

It is an amenable number.

404099989 is a deficient number, since it is larger than the sum of its proper divisors (1).

404099989 is an equidigital number, since it uses as much as digits as its factorization.

404099989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 839808, while the sum is 52.

The square root of 404099989 is about 20102.2384076998. The cubic root of 404099989 is about 739.3151620005.

The spelling of 404099989 in words is "four hundred four million, ninety-nine thousand, nine hundred eighty-nine".