1808194 has 4 divisors (see below), whose sum is σ = 2712294. Its totient is φ = 904096.

The previous prime is 1808167. The next prime is 1808207. The reversal of 1808194 is 4918081.

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

It can be written as a sum of positive squares in only one way, i.e., 1352569 + 455625 = 1163^2 + 675^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 452047 + ... + 452050.

2^1808194 is an apocalyptic number.

1808194 is a deficient number, since it is larger than the sum of its proper divisors (904100).

1808194 is an equidigital number, since it uses as much as digits as its factorization.

1808194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 904099.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 1808194 is about 1344.6910425819. The cubic root of 1808194 is about 121.8283440964.

It can be divided in two parts, 1808 and 194, that added together give a palindrome (2002).

The spelling of 1808194 in words is "one million, eight hundred eight thousand, one hundred ninety-four".