1821912 has 16 divisors (see below), whose sum is σ = 4554840. Its totient is φ = 607296.

The previous prime is 1821893. The next prime is 1821913. The reversal of 1821912 is 2191281.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 75913 = 1821912 / (1 + 8 + 2 + 1 + 9 + 1 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821913) 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, 37933 + ... + 37980.

2^1821912 is an apocalyptic number.

1821912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1821912 is an abundant number, since it is smaller than the sum of its proper divisors (2732928).

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

1821912 is a wasteful number, since it uses less digits than its factorization.

1821912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75922 (or 75918 counting only the distinct ones).

The product of its digits is 288, while the sum is 24.

The square root of 1821912 is about 1349.7822046538. The cubic root of 1821912 is about 122.1356548930.

The spelling of 1821912 in words is "one million, eight hundred twenty-one thousand, nine hundred twelve".