397812 has 12 divisors (see below), whose sum is σ = 928256. Its totient is φ = 132600.

The previous prime is 397811. The next prime is 397829. The reversal of 397812 is 218793.

Added to its reverse (218793) it gives a triangular number (616605 = T₁₁₁₀).

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 397812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16564 + ... + 16587.

2³⁹⁷⁸¹² is an apocalyptic number.

It is an amenable number.

397812 is an abundant number, since it is smaller than the sum of its proper divisors (530444).

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

397812 is a wasteful number, since it uses less digits than its factorization.

397812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33158 (or 33156 counting only the distinct ones).

The product of its digits is 3024, while the sum is 30.

The square root of 397812 is about 630.7233942070. The cubic root of 397812 is about 73.5460399225.

Adding to 397812 its reverse (218793), we get a triangular number (616605 = T₁₁₁₀).

The spelling of 397812 in words is "three hundred ninety-seven thousand, eight hundred twelve".