812542 has 4 divisors (see below), whose sum is σ = 1218816. Its totient is φ = 406270.

The previous prime is 812527. The next prime is 812587. The reversal of 812542 is 245218.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 245218 = 2 ⋅122609.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

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, 203134 + ... + 203137.

It is an arithmetic number, because the mean of its divisors is an integer number (304704).

2⁸¹²⁵⁴² is an apocalyptic number.

812542 is a deficient number, since it is larger than the sum of its proper divisors (406274).

812542 is a wasteful number, since it uses less digits than its factorization.

812542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406273.

The product of its digits is 640, while the sum is 22.

The square root of 812542 is about 901.4111159732. The cubic root of 812542 is about 93.3143867437.

The spelling of 812542 in words is "eight hundred twelve thousand, five hundred forty-two".