812340 has 36 divisors (see below), whose sum is σ = 2464644. Its totient is φ = 216576.

The previous prime is 812309. The next prime is 812341. The reversal of 812340 is 43218.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 86436 + 725904 = 294^2 + 852^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812341) 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, 2077 + ... + 2436.

2⁸¹²³⁴⁰ is an apocalyptic number.

It is an amenable number.

812340 is an abundant number, since it is smaller than the sum of its proper divisors (1652304).

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

812340 is a wasteful number, since it uses less digits than its factorization.

812340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4528 (or 4523 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 812340 is about 901.2990624648. The cubic root of 812340 is about 93.3066533718.

Adding to 812340 its reverse (43218), we get a palindrome (855558).

The spelling of 812340 in words is "eight hundred twelve thousand, three hundred forty".