812385 has 24 divisors (see below), whose sum is σ = 1609920. Its totient is φ = 371232.

The previous prime is 812381. The next prime is 812387. The reversal of 812385 is 583218.

It is a happy number.

It is not a de Polignac number, because 812385 - 2² = 812381 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (812381) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 975 + ... + 1604.

It is an arithmetic number, because the mean of its divisors is an integer number (67080).

2⁸¹²³⁸⁵ is an apocalyptic number.

It is an amenable number.

812385 is a deficient number, since it is larger than the sum of its proper divisors (797535).

812385 is a wasteful number, since it uses less digits than its factorization.

812385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2597 (or 2594 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 812385 is about 901.3240260861. The cubic root of 812385 is about 93.3083762637.

The spelling of 812385 in words is "eight hundred twelve thousand, three hundred eighty-five".