1813199 has 4 divisors (see below), whose sum is σ = 1817736. Its totient is φ = 1808664.

The previous prime is 1813177. The next prime is 1813211. The reversal of 1813199 is 9913181.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1813199 - 2²⁰ = 764623 is a prime.

It is a super-2 number, since 2×1813199² = 6575381227202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813139) 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, 1604 + ... + 2489.

It is an arithmetic number, because the mean of its divisors is an integer number (454434).

2^1813199 is an apocalyptic number.

1813199 is a deficient number, since it is larger than the sum of its proper divisors (4537).

1813199 is an equidigital number, since it uses as much as digits as its factorization.

1813199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4536.

The product of its digits is 1944, while the sum is 32.

The square root of 1813199 is about 1346.5507788420. The cubic root of 1813199 is about 121.9406456780.

The spelling of 1813199 in words is "one million, eight hundred thirteen thousand, one hundred ninety-nine".