1813899 has 8 divisors (see below), whose sum is σ = 2426512. Its totient is φ = 1205280.

The previous prime is 1813897. The next prime is 1813901. The reversal of 1813899 is 9983181.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1813897) and next prime (1813901).

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

It is not a de Polignac number, because 1813899 - 2¹ = 1813897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1813897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 309 + ... + 1929.

It is an arithmetic number, because the mean of its divisors is an integer number (303314).

2^1813899 is an apocalyptic number.

1813899 is a deficient number, since it is larger than the sum of its proper divisors (612613).

1813899 is a wasteful number, since it uses less digits than its factorization.

1813899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1997.

The product of its digits is 15552, while the sum is 39.

The square root of 1813899 is about 1346.8106771184. The cubic root of 1813899 is about 121.9563357135.

The spelling of 1813899 in words is "one million, eight hundred thirteen thousand, eight hundred ninety-nine".