812397 has 4 divisors (see below), whose sum is σ = 1083200. Its totient is φ = 541596.

The previous prime is 812393. The next prime is 812401. The reversal of 812397 is 793218.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (812393) and next prime (812401).

It is not a de Polignac number, because 812397 - 2² = 812393 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135397 + ... + 135402.

It is an arithmetic number, because the mean of its divisors is an integer number (270800).

2⁸¹²³⁹⁷ is an apocalyptic number.

It is an amenable number.

812397 is a deficient number, since it is larger than the sum of its proper divisors (270803).

812397 is a wasteful number, since it uses less digits than its factorization.

812397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270802.

The product of its digits is 3024, while the sum is 30.

The square root of 812397 is about 901.3306829350. The cubic root of 812397 is about 93.3088356907.

The spelling of 812397 in words is "eight hundred twelve thousand, three hundred ninety-seven".