818402 has 8 divisors (see below), whose sum is σ = 1322076. Its totient is φ = 377712.

The previous prime is 818399. The next prime is 818413. The reversal of 818402 is 204818.

It can be written as a sum of positive squares in 2 ways, for example, as 808201 + 10201 = 899^2 + 101^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15713 + ... + 15764.

2⁸¹⁸⁴⁰² is an apocalyptic number.

818402 is a deficient number, since it is larger than the sum of its proper divisors (503674).

818402 is a wasteful number, since it uses less digits than its factorization.

818402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31492.

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 818402 is about 904.6557356254. The cubic root of 818402 is about 93.5381753803.

The spelling of 818402 in words is "eight hundred eighteen thousand, four hundred two".