402634009 has 2 divisors, whose sum is σ = 402634010. Its totient is φ = 402634008.

The previous prime is 402634003. The next prime is 402634013. The reversal of 402634009 is 900436204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 399200400 + 3433609 = 19980^2 + 1853^2 .

It is a cyclic number.

It is not a de Polignac number, because 402634009 - 2¹⁷ = 402502937 is a prime.

It is a super-2 number, since 2×402634009² = 324228290406824162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (402634003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201317004 + 201317005.

It is an arithmetic number, because the mean of its divisors is an integer number (201317005).

Almost surely, 2^402634009 is an apocalyptic number.

It is an amenable number.

402634009 is a deficient number, since it is larger than the sum of its proper divisors (1).

402634009 is an equidigital number, since it uses as much as digits as its factorization.

402634009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 402634009 is about 20065.7421741634. The cubic root of 402634009 is about 738.4200580369.

The spelling of 402634009 in words is "four hundred two million, six hundred thirty-four thousand, nine".