812838 has 32 divisors (see below), whose sum is σ = 1856736. Its totient is φ = 235008.

The previous prime is 812807. The next prime is 812849. The reversal of 812838 is 838218.

812838 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×812838² = 1321411228488, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1020 + ... + 1632.

It is an arithmetic number, because the mean of its divisors is an integer number (58023).

2⁸¹²⁸³⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 812838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (928368).

812838 is an abundant number, since it is smaller than the sum of its proper divisors (1043898).

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

812838 is a wasteful number, since it uses less digits than its factorization.

812838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648.

The product of its digits is 3072, while the sum is 30.

The square root of 812838 is about 901.5752880376. The cubic root of 812838 is about 93.3257164986.

The spelling of 812838 in words is "eight hundred twelve thousand, eight hundred thirty-eight".