1812740 has 24 divisors (see below), whose sum is σ = 3832920. Its totient is φ = 720128.

The previous prime is 1812721. The next prime is 1812749. The reversal of 1812740 is 472181.

It can be written as a sum of positive squares in 4 ways, for example, as 1024 + 1811716 = 32^2 + 1346^2 .

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1812749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4466 + ... + 4854.

It is an arithmetic number, because the mean of its divisors is an integer number (159705).

2^1812740 is an apocalyptic number.

1812740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1812740 is an abundant number, since it is smaller than the sum of its proper divisors (2020180).

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

1812740 is a wasteful number, since it uses less digits than its factorization.

1812740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631 (or 629 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 1812740 is about 1346.3803325955. The cubic root of 1812740 is about 121.9303553054.

It can be divided in two parts, 1812 and 740, that added together give a palindrome (2552).

The spelling of 1812740 in words is "one million, eight hundred twelve thousand, seven hundred forty".