1818899 has 4 divisors (see below), whose sum is σ = 1823400. Its totient is φ = 1814400.

The previous prime is 1818871. The next prime is 1818919. The reversal of 1818899 is 9988181.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9988181 = 7 ⋅1426883.

It is a cyclic number.

It is not a de Polignac number, because 1818899 - 2¹² = 1814803 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

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, 1577 + ... + 2474.

It is an arithmetic number, because the mean of its divisors is an integer number (455850).

2^1818899 is an apocalyptic number.

1818899 is a deficient number, since it is larger than the sum of its proper divisors (4501).

1818899 is an equidigital number, since it uses as much as digits as its factorization.

1818899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4500.

The product of its digits is 41472, while the sum is 44.

The square root of 1818899 is about 1348.6656368426. The cubic root of 1818899 is about 122.0682901734.

The spelling of 1818899 in words is "one million, eight hundred eighteen thousand, eight hundred ninety-nine".