810442 has 4 divisors (see below), whose sum is σ = 1215666. Its totient is φ = 405220.

The previous prime is 810437. The next prime is 810443. The reversal of 810442 is 244018.

810442 is nontrivially palindromic in base 9.

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., 687241 + 123201 = 829^2 + 351^2 .

It is not an unprimeable number, because it can be changed into a prime (810443) by changing a digit.

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 as a sum of consecutive naturals, namely, 202609 + ... + 202612.

2⁸¹⁰⁴⁴² is an apocalyptic number.

810442 is a deficient number, since it is larger than the sum of its proper divisors (405224).

810442 is a wasteful number, since it uses less digits than its factorization.

810442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405223.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 810442 is about 900.2455220661. The cubic root of 810442 is about 93.2339276111.

The spelling of 810442 in words is "eight hundred ten thousand, four hundred forty-two".