402496409 has 4 divisors (see below), whose sum is σ = 459995904. Its totient is φ = 344996916.

The previous prime is 402496379. The next prime is 402496417. The reversal of 402496409 is 904694204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402496409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402496439) 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, 28749737 + ... + 28749750.

It is an arithmetic number, because the mean of its divisors is an integer number (114998976).

Almost surely, 2^402496409 is an apocalyptic number.

It is an amenable number.

402496409 is a deficient number, since it is larger than the sum of its proper divisors (57499495).

402496409 is an equidigital number, since it uses as much as digits as its factorization.

402496409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57499494.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 402496409 is about 20062.3131517779. The cubic root of 402496409 is about 738.3359302065.

The spelling of 402496409 in words is "four hundred two million, four hundred ninety-six thousand, four hundred nine".