1812456 has 40 divisors (see below), whose sum is σ = 5078370. Its totient is φ = 603936.

The previous prime is 1812449. The next prime is 1812457. The reversal of 1812456 is 6542181.

It can be written as a sum of positive squares in only one way, i.e., 1368900 + 443556 = 1170^2 + 666^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1812457) by changing a digit.

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 9 ways as a sum of consecutive naturals, for example, 751 + ... + 2046.

2^1812456 is an apocalyptic number.

It is an amenable number.

1812456 is an abundant number, since it is smaller than the sum of its proper divisors (3265914).

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

1812456 is a wasteful number, since it uses less digits than its factorization.

1812456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2815 (or 2802 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 1812456 is about 1346.2748604947. The cubic root of 1812456 is about 121.9239874076.

The spelling of 1812456 in words is "one million, eight hundred twelve thousand, four hundred fifty-six".