1918812 has 48 divisors (see below), whose sum is σ = 5225472. Its totient is φ = 536640.

The previous prime is 1918811. The next prime is 1918817. The reversal of 1918812 is 2188191.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1918812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918811) 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, 4237 + ... + 4667.

It is an arithmetic number, because the mean of its divisors is an integer number (108864).

2^1918812 is an apocalyptic number.

1918812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1918812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2612736).

1918812 is an abundant number, since it is smaller than the sum of its proper divisors (3306660).

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

1918812 is a wasteful number, since it uses less digits than its factorization.

1918812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498 (or 496 counting only the distinct ones).

The product of its digits is 1152, while the sum is 30.

The square root of 1918812 is about 1385.2118971479. The cubic root of 1918812 is about 124.2636602810.

The spelling of 1918812 in words is "one million, nine hundred eighteen thousand, eight hundred twelve".