402334409 has 4 divisors (see below), whose sum is σ = 406318020. Its totient is φ = 398350800.

The previous prime is 402334391. The next prime is 402334417. The reversal of 402334409 is 904433204.

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 389944009 + 12390400 = 19747^2 + 3520^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402334409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402334109) 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 in 3 ways as a sum of consecutive naturals, for example, 1991654 + ... + 1991855.

It is an arithmetic number, because the mean of its divisors is an integer number (101579505).

Almost surely, 2^402334409 is an apocalyptic number.

It is an amenable number.

402334409 is a deficient number, since it is larger than the sum of its proper divisors (3983611).

402334409 is a wasteful number, since it uses less digits than its factorization.

402334409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3983610.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 402334409 is about 20058.2753246634. The cubic root of 402334409 is about 738.2368597810.

The spelling of 402334409 in words is "four hundred two million, three hundred thirty-four thousand, four hundred nine".