812399 has 8 divisors (see below), whose sum is σ = 950400. Its totient is φ = 679896.

The previous prime is 812393. The next prime is 812401. The reversal of 812399 is 993218.

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

It is a de Polignac number, because none of the positive numbers 2^k-812399 is a prime.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1049 + ... + 1650.

It is an arithmetic number, because the mean of its divisors is an integer number (118800).

2⁸¹²³⁹⁹ is an apocalyptic number.

812399 is a deficient number, since it is larger than the sum of its proper divisors (138001).

812399 is a wasteful number, since it uses less digits than its factorization.

812399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2749.

The product of its digits is 3888, while the sum is 32.

The square root of 812399 is about 901.3317924050. The cubic root of 812399 is about 93.3089122615.

The spelling of 812399 in words is "eight hundred twelve thousand, three hundred ninety-nine".