1813999 has 8 divisors (see below), whose sum is σ = 2032848. Its totient is φ = 1604160.

The previous prime is 1813993. The next prime is 1814003. The reversal of 1813999 is 9993181.

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 1813999 - 2³ = 1813991 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 (1813991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1822 + ... + 2635.

It is an arithmetic number, because the mean of its divisors is an integer number (254106).

2^1813999 is an apocalyptic number.

1813999 is a deficient number, since it is larger than the sum of its proper divisors (218849).

1813999 is a wasteful number, since it uses less digits than its factorization.

1813999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4505.

The product of its digits is 17496, while the sum is 40.

The square root of 1813999 is about 1346.8478013495. The cubic root of 1813999 is about 121.9585768176.

The spelling of 1813999 in words is "one million, eight hundred thirteen thousand, nine hundred ninety-nine".