402818 has 8 divisors (see below), whose sum is σ = 650748. Its totient is φ = 185904.

The previous prime is 402817. The next prime is 402823. The reversal of 402818 is 818204.

402818 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 316969 + 85849 = 563^2 + 293^2 .

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

It is a super-2 number, since 2×402818² = 324524682248, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 402793 and 402802.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 402818.

It is not an unprimeable number, because it can be changed into a prime (402817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7721 + ... + 7772.

2⁴⁰²⁸¹⁸ is an apocalyptic number.

402818 is a deficient number, since it is larger than the sum of its proper divisors (247930).

402818 is a wasteful number, since it uses less digits than its factorization.

402818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15508.

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

The square root of 402818 is about 634.6794466500. The cubic root of 402818 is about 73.8532519108.

The spelling of 402818 in words is "four hundred two thousand, eight hundred eighteen".