1818897 has 4 divisors (see below), whose sum is σ = 2425200. Its totient is φ = 1212596.

The previous prime is 1818871. The next prime is 1818919. The reversal of 1818897 is 7988181.

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.

It is a cyclic number.

It is not a de Polignac number, because 1818897 - 2⁶ = 1818833 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1813897) 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, 303147 + ... + 303152.

It is an arithmetic number, because the mean of its divisors is an integer number (606300).

2^1818897 is an apocalyptic number.

It is an amenable number.

1818897 is a deficient number, since it is larger than the sum of its proper divisors (606303).

1818897 is an equidigital number, since it uses as much as digits as its factorization.

1818897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606302.

The product of its digits is 32256, while the sum is 42.

The square root of 1818897 is about 1348.6648953687. The cubic root of 1818897 is about 122.0682454327.

It can be divided in two parts, 18 and 18897, that added together give a triangular number (18915 = T₁₉₄).

The spelling of 1818897 in words is "one million, eight hundred eighteen thousand, eight hundred ninety-seven".