404912909 has 2 divisors, whose sum is σ = 404912910. Its totient is φ = 404912908.

The previous prime is 404912903. The next prime is 404912923. The reversal of 404912909 is 909219404.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 333172009 + 71740900 = 18253^2 + 8470^2 .

It is a cyclic number.

It is not a de Polignac number, because 404912909 - 2⁸ = 404912653 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404912903) 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, 202456454 + 202456455.

It is an arithmetic number, because the mean of its divisors is an integer number (202456455).

Almost surely, 2^404912909 is an apocalyptic number.

It is an amenable number.

404912909 is a deficient number, since it is larger than the sum of its proper divisors (1).

404912909 is an equidigital number, since it uses as much as digits as its factorization.

404912909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 404912909 is about 20122.4478878689. The cubic root of 404912909 is about 739.8105851946.

The spelling of 404912909 in words is "four hundred four million, nine hundred twelve thousand, nine hundred nine".