402302009 has 2 divisors, whose sum is σ = 402302010. Its totient is φ = 402302008.

The previous prime is 402301931. The next prime is 402302063. The reversal of 402302009 is 900203204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 313998400 + 88303609 = 17720^2 + 9397^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402302009 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (402382009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201151004 + 201151005.

It is an arithmetic number, because the mean of its divisors is an integer number (201151005).

Almost surely, 2^402302009 is an apocalyptic number.

It is an amenable number.

402302009 is a deficient number, since it is larger than the sum of its proper divisors (1).

402302009 is an equidigital number, since it uses as much as digits as its factorization.

402302009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 402302009 is about 20057.4676616965. The cubic root of 402302009 is about 738.2170425048.

The spelling of 402302009 in words is "four hundred two million, three hundred two thousand, nine".