1812330 has 48 divisors (see below), whose sum is σ = 5077800. Its totient is φ = 445824.

The previous prime is 1812311. The next prime is 1812341. The reversal of 1812330 is 332181.

It can be written as a sum of positive squares in 4 ways, for example, as 986049 + 826281 = 993^2 + 909^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

1812330 is a Rhonda number in base 8.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 396 + ... + 1944.

2^1812330 is an apocalyptic number.

1812330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1812330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2538900).

1812330 is an abundant number, since it is smaller than the sum of its proper divisors (3265470).

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

1812330 is a wasteful number, since it uses less digits than its factorization.

1812330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1575 (or 1572 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1812330 is about 1346.2280638881. The cubic root of 1812330 is about 121.9211620004.

The spelling of 1812330 in words is "one million, eight hundred twelve thousand, three hundred thirty".