1812400 has 60 divisors (see below), whose sum is σ = 4566672. Its totient is φ = 689920.

The previous prime is 1812383. The next prime is 1812401. The reversal of 1812400 is 42181.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (1812401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9102 + ... + 9298.

2^1812400 is an apocalyptic number.

1812400 is a gapful number since it is divisible by the number (10) 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 1812400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2283336).

1812400 is an abundant number, since it is smaller than the sum of its proper divisors (2754272).

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

1812400 is a wasteful number, since it uses less digits than its factorization.

1812400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238 (or 227 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 1812400 is about 1346.2540622037. The cubic root of 1812400 is about 121.9227316872.

Adding to 1812400 its reverse (42181), we get a palindrome (1854581).

The spelling of 1812400 in words is "one million, eight hundred twelve thousand, four hundred".