818042 has 4 divisors (see below), whose sum is σ = 1227066. Its totient is φ = 409020.

The previous prime is 818021. The next prime is 818093. The reversal of 818042 is 240818.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 811801 + 6241 = 901^2 + 79^2 .

It is a junction number, because it is equal to n+sod(n) for n = 817999 and 818017.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 204509 + ... + 204512.

2⁸¹⁸⁰⁴² is an apocalyptic number.

818042 is a deficient number, since it is larger than the sum of its proper divisors (409024).

818042 is a wasteful number, since it uses less digits than its factorization.

818042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409023.

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

The square root of 818042 is about 904.4567430231. The cubic root of 818042 is about 93.5244581273.

The spelling of 818042 in words is "eight hundred eighteen thousand, forty-two".