1818197 has 4 divisors (see below), whose sum is σ = 1821036. Its totient is φ = 1815360.

The previous prime is 1818163. The next prime is 1818199. The reversal of 1818197 is 7918181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7918181 = 599 ⋅13219.

It can be written as a sum of positive squares in 2 ways, for example, as 707281 + 1110916 = 841^2 + 1054^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1818197 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 (1818199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47 + ... + 1907.

It is an arithmetic number, because the mean of its divisors is an integer number (455259).

2^1818197 is an apocalyptic number.

It is an amenable number.

1818197 is a deficient number, since it is larger than the sum of its proper divisors (2839).

1818197 is an equidigital number, since it uses as much as digits as its factorization.

1818197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2838.

The product of its digits is 4032, while the sum is 35.

The square root of 1818197 is about 1348.4053544836. The cubic root of 1818197 is about 122.0525841582.

The spelling of 1818197 in words is "one million, eight hundred eighteen thousand, one hundred ninety-seven".