1812745 has 16 divisors (see below), whose sum is σ = 2477952. Its totient is φ = 1260160.

The previous prime is 1812721. The next prime is 1812749. The reversal of 1812745 is 5472181.

It is not a de Polignac number, because 1812745 - 2⁹ = 1812233 is a prime.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian 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 15 ways as a sum of consecutive naturals, for example, 549 + ... + 1981.

It is an arithmetic number, because the mean of its divisors is an integer number (154872).

2^1812745 is an apocalyptic number.

It is an amenable number.

1812745 is a deficient number, since it is larger than the sum of its proper divisors (665207).

1812745 is a wasteful number, since it uses less digits than its factorization.

1812745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1472.

The product of its digits is 2240, while the sum is 28.

The square root of 1812745 is about 1346.3821894247. The cubic root of 1812745 is about 121.9304674103.

It can be divided in two parts, 181 and 2745, that added together give a triangular number (2926 = T₇₆).

The spelling of 1812745 in words is "one million, eight hundred twelve thousand, seven hundred forty-five".