812977 has 4 divisors (see below), whose sum is σ = 886896. Its totient is φ = 739060.

The previous prime is 812969. The next prime is 813013. The reversal of 812977 is 779218.

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 a cyclic number.

It is not a de Polignac number, because 812977 - 2³ = 812969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (812477) 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, 36943 + ... + 36964.

It is an arithmetic number, because the mean of its divisors is an integer number (221724).

2⁸¹²⁹⁷⁷ is an apocalyptic number.

It is an amenable number.

812977 is a deficient number, since it is larger than the sum of its proper divisors (73919).

812977 is a wasteful number, since it uses less digits than its factorization.

812977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73918.

The product of its digits is 7056, while the sum is 34.

The square root of 812977 is about 901.6523720370. The cubic root of 812977 is about 93.3310359412.

The spelling of 812977 in words is "eight hundred twelve thousand, nine hundred seventy-seven".