1813889 has 8 divisors (see below), whose sum is σ = 2261568. Its totient is φ = 1413360.

The previous prime is 1813853. The next prime is 1813897. The reversal of 1813889 is 9883181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1813889 - 2¹² = 1809793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1813829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11702 + ... + 11855.

It is an arithmetic number, because the mean of its divisors is an integer number (282696).

2^1813889 is an apocalyptic number.

It is an amenable number.

1813889 is a deficient number, since it is larger than the sum of its proper divisors (447679).

1813889 is a wasteful number, since it uses less digits than its factorization.

1813889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23575.

The product of its digits is 13824, while the sum is 38.

The square root of 1813889 is about 1346.8069646390. The cubic root of 1813889 is about 121.9561115985.

The spelling of 1813889 in words is "one million, eight hundred thirteen thousand, eight hundred eighty-nine".