812642 has 8 divisors (see below), whose sum is σ = 1239132. Its totient is φ = 399600.

The previous prime is 812641. The next prime is 812671. The reversal of 812642 is 246218.

It can be written as a sum of positive squares in 2 ways, for example, as 811801 + 841 = 901^2 + 29^2 .

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

It is a super-4 number, since 4×812642⁴ (a number of 25 digits) contains 4444 as substring.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (812641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3209 + ... + 3452.

2⁸¹²⁶⁴² is an apocalyptic number.

812642 is a deficient number, since it is larger than the sum of its proper divisors (426490).

812642 is a wasteful number, since it uses less digits than its factorization.

812642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6724.

The product of its digits is 768, while the sum is 23.

The square root of 812642 is about 901.4665828526. The cubic root of 812642 is about 93.3182146713.

The spelling of 812642 in words is "eight hundred twelve thousand, six hundred forty-two".