404342009 has 2 divisors, whose sum is σ = 404342010. Its totient is φ = 404342008.

The previous prime is 404341999. The next prime is 404342017. The reversal of 404342009 is 900243404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 333865984 + 70476025 = 18272^2 + 8395^2 .

It is a cyclic number.

It is not a de Polignac number, because 404342009 - 2²⁰ = 403293433 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (404342069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202171004 + 202171005.

It is an arithmetic number, because the mean of its divisors is an integer number (202171005).

Almost surely, 2^404342009 is an apocalyptic number.

It is an amenable number.

404342009 is a deficient number, since it is larger than the sum of its proper divisors (1).

404342009 is an equidigital number, since it uses as much as digits as its factorization.

404342009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 404342009 is about 20108.2572342806. The cubic root of 404342009 is about 739.4627272495.

The spelling of 404342009 in words is "four hundred four million, three hundred forty-two thousand, nine".