1818045 has 30 divisors (see below), whose sum is σ = 3308382. Its totient is φ = 955152.

The previous prime is 1818023. The next prime is 1818049. The reversal of 1818045 is 5408181.

It can be written as a sum of positive squares in only one way, i.e., 1454436 + 363609 = 1206^2 + 603^2 .

It is not a de Polignac number, because 1818045 - 2⁵ = 1818013 is a prime.

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

1818045 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818049) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 27102 + ... + 27168.

2^1818045 is an apocalyptic number.

1818045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1818045 is a deficient number, since it is larger than the sum of its proper divisors (1490337).

1818045 is an frugal number, since it uses more digits than its factorization.

1818045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151 (or 75 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 1818045 is about 1348.3489904324. The cubic root of 1818045 is about 122.0491828931.

Multiplying 1818045 by its product of nonzero digits (1280), we get a square (2327097600 = 48240²).

It can be divided in two parts, 18180 and 45, that added together give a square (18225 = 135²).

The spelling of 1818045 in words is "one million, eight hundred eighteen thousand, forty-five".