812636 has 36 divisors (see below), whose sum is σ = 1653456. Its totient is φ = 348480.

The previous prime is 812633. The next prime is 812639. The reversal of 812636 is 636218.

812636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (812633) and next prime (812639).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812633) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11096 + ... + 11168.

2⁸¹²⁶³⁶ is an apocalyptic number.

It is an amenable number.

812636 is an abundant number, since it is smaller than the sum of its proper divisors (840820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

812636 is a wasteful number, since it uses less digits than its factorization.

812636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122 (or 109 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 812636 is about 901.4632549361. The cubic root of 812636 is about 93.3179850045.

It can be divided in two parts, 81263 and 6, that multiplied together give a triangular number (487578 = T₉₈₇).

The spelling of 812636 in words is "eight hundred twelve thousand, six hundred thirty-six".