812985 has 16 divisors (see below), whose sum is σ = 1318464. Its totient is φ = 427712.

The previous prime is 812969. The next prime is 813013. The reversal of 812985 is 589218.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 812985 - 2⁴ = 812969 is a prime.

It is a super-2 number, since 2×812985² = 1321889220450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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

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, 919 + ... + 1571.

It is an arithmetic number, because the mean of its divisors is an integer number (82404).

2⁸¹²⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

812985 is a deficient number, since it is larger than the sum of its proper divisors (505479).

812985 is a wasteful number, since it uses less digits than its factorization.

812985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744.

The product of its digits is 5760, while the sum is 33.

The square root of 812985 is about 901.6568083257. The cubic root of 812985 is about 93.3313420777.

The spelling of 812985 in words is "eight hundred twelve thousand, nine hundred eighty-five".