1818493 has 4 divisors (see below), whose sum is σ = 1830688. Its totient is φ = 1806300.

The previous prime is 1818469. The next prime is 1818499. The reversal of 1818493 is 3948181.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3948181 = 19 ⋅207799.

It is a cyclic number.

It is not a de Polignac number, because 1818493 - 2¹⁷ = 1687421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5871 + ... + 6172.

It is an arithmetic number, because the mean of its divisors is an integer number (457672).

2^1818493 is an apocalyptic number.

It is an amenable number.

1818493 is a deficient number, since it is larger than the sum of its proper divisors (12195).

1818493 is a wasteful number, since it uses less digits than its factorization.

1818493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12194.

The product of its digits is 6912, while the sum is 34.

The square root of 1818493 is about 1348.5151092961. The cubic root of 1818493 is about 122.0592071304.

The spelling of 1818493 in words is "one million, eight hundred eighteen thousand, four hundred ninety-three".