1818889 has 4 divisors (see below), whose sum is σ = 1914640. Its totient is φ = 1723140.

The previous prime is 1818871. The next prime is 1818919. The reversal of 1818889 is 9888181.

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: 9888181 = 317 ⋅31193.

It is a cyclic number.

It is not a de Polignac number, because 1818889 - 2¹⁵ = 1786121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1818689) 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, 47847 + ... + 47884.

It is an arithmetic number, because the mean of its divisors is an integer number (478660).

2^1818889 is an apocalyptic number.

1818889 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1818889 is a deficient number, since it is larger than the sum of its proper divisors (95751).

1818889 is an equidigital number, since it uses as much as digits as its factorization.

1818889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95750.

The product of its digits is 36864, while the sum is 43.

The square root of 1818889 is about 1348.6619294694. The cubic root of 1818889 is about 122.0680664694.

The spelling of 1818889 in words is "one million, eight hundred eighteen thousand, eight hundred eighty-nine".