402804665 has 8 divisors (see below), whose sum is σ = 488152008. Its totient is φ = 319052800.

The previous prime is 402804643. The next prime is 402804667. The reversal of 402804665 is 566408204.

It can be written as a sum of positive squares in 4 ways, for example, as 203119504 + 199685161 = 14252^2 + 14131^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 402804665 - 2¹⁰ = 402803641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402804667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 398312 + ... + 399321.

It is an arithmetic number, because the mean of its divisors is an integer number (61019001).

Almost surely, 2^402804665 is an apocalyptic number.

It is an amenable number.

402804665 is a deficient number, since it is larger than the sum of its proper divisors (85347343).

402804665 is a wasteful number, since it uses less digits than its factorization.

402804665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797739.

The product of its (nonzero) digits is 46080, while the sum is 35.

The square root of 402804665 is about 20069.9941454899. The cubic root of 402804665 is about 738.5243694884.

The spelling of 402804665 in words is "four hundred two million, eight hundred four thousand, six hundred sixty-five".