402342209 has 4 divisors (see below), whose sum is σ = 402473604. Its totient is φ = 402210816.

The previous prime is 402342163. The next prime is 402342229. The reversal of 402342209 is 902243204.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 395890609 + 6451600 = 19897^2 + 2540^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402342209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402342229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60992 + ... + 67265.

It is an arithmetic number, because the mean of its divisors is an integer number (100618401).

Almost surely, 2^402342209 is an apocalyptic number.

It is an amenable number.

402342209 is a deficient number, since it is larger than the sum of its proper divisors (131395).

402342209 is a wasteful number, since it uses less digits than its factorization.

402342209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131394.

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

The square root of 402342209 is about 20058.4697571874. The cubic root of 402342209 is about 738.2416304478.

The spelling of 402342209 in words is "four hundred two million, three hundred forty-two thousand, two hundred nine".