6391812 has 48 divisors (see below), whose sum is σ = 17418240. Its totient is φ = 1786272.

The previous prime is 6391799. The next prime is 6391817. The reversal of 6391812 is 2181936.

It is a self number, because there is not a number n which added to its sum of digits gives 6391812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6391817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3139 + ... + 4757.

It is an arithmetic number, because the mean of its divisors is an integer number (362880).

Almost surely, 2^6391812 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 6391812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8709120).

6391812 is an abundant number, since it is smaller than the sum of its proper divisors (11026428).

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

6391812 is a wasteful number, since it uses less digits than its factorization.

6391812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1680 (or 1678 counting only the distinct ones).

The product of its digits is 2592, while the sum is 30.

The square root of 6391812 is about 2528.2033146090. The cubic root of 6391812 is about 185.5843417850.

The spelling of 6391812 in words is "six million, three hundred ninety-one thousand, eight hundred twelve".