1812340 has 12 divisors (see below), whose sum is σ = 3805956. Its totient is φ = 724928.

The previous prime is 1812311. The next prime is 1812341. The reversal of 1812340 is 432181.

It can be written as a sum of positive squares in 2 ways, for example, as 1430416 + 381924 = 1196^2 + 618^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1812341) 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 3 ways as a sum of consecutive naturals, for example, 45289 + ... + 45328.

It is an arithmetic number, because the mean of its divisors is an integer number (317163).

2^1812340 is an apocalyptic number.

1812340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1812340 is an abundant number, since it is smaller than the sum of its proper divisors (1993616).

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

1812340 is a wasteful number, since it uses less digits than its factorization.

1812340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90626 (or 90624 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1812340 is about 1346.2317779640. The cubic root of 1812340 is about 121.9213862439.

The spelling of 1812340 in words is "one million, eight hundred twelve thousand, three hundred forty".