3997812 has 72 divisors (see below), whose sum is σ = 11708256. Its totient is φ = 1052352.

The previous prime is 3997811. The next prime is 3997849. The reversal of 3997812 is 2187993.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3997811) 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, 7383 + ... + 7905.

Almost surely, 2^3997812 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3997812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5854128).

3997812 is an abundant number, since it is smaller than the sum of its proper divisors (7710444).

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

3997812 is a wasteful number, since it uses less digits than its factorization.

3997812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557 (or 548 counting only the distinct ones).

The product of its digits is 27216, while the sum is 39.

The square root of 3997812 is about 1999.4529251773. The cubic root of 3997812 is about 158.7111563053.

The spelling of 3997812 in words is "three million, nine hundred ninety-seven thousand, eight hundred twelve".