997812 has 24 divisors (see below), whose sum is σ = 2587200. Its totient is φ = 332568.

The previous prime is 997811. The next prime is 997813. The reversal of 997812 is 218799.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (997811) and next prime (997813).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 997812.

It is not an unprimeable number, because it can be changed into a prime (997811) 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, 4512 + ... + 4727.

It is an arithmetic number, because the mean of its divisors is an integer number (107800).

2⁹⁹⁷⁸¹² is an apocalyptic number.

It is an amenable number.

997812 is an abundant number, since it is smaller than the sum of its proper divisors (1589388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

997812 is a wasteful number, since it uses less digits than its factorization.

997812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9252 (or 9244 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 997812 is about 998.9054009264. The cubic root of 997812 is about 99.9270134092.

The spelling of 997812 in words is "nine hundred ninety-seven thousand, eight hundred twelve".