1813807 has 4 divisors (see below), whose sum is σ = 1824120. Its totient is φ = 1803496.

The previous prime is 1813793. The next prime is 1813813. The reversal of 1813807 is 7083181.

It is a happy number.

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 1813807 - 2¹¹ = 1811759 is a prime.

It is a Duffinian number.

1813807 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813817) 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, 4888 + ... + 5245.

It is an arithmetic number, because the mean of its divisors is an integer number (456030).

2^1813807 is an apocalyptic number.

1813807 is a deficient number, since it is larger than the sum of its proper divisors (10313).

1813807 is a wasteful number, since it uses less digits than its factorization.

1813807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10312.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 1813807 is about 1346.7765219219. The cubic root of 1813807 is about 121.9542738250.

Adding to 1813807 its reverse (7083181), we get a palindrome (8896988).

The spelling of 1813807 in words is "one million, eight hundred thirteen thousand, eight hundred seven".