1816838 has 4 divisors (see below), whose sum is σ = 2725260. Its totient is φ = 908418.

The previous prime is 1816831. The next prime is 1816849. The reversal of 1816838 is 8386181.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 1816798 and 1816807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1816831) by changing a digit.

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, 454208 + ... + 454211.

It is an arithmetic number, because the mean of its divisors is an integer number (681315).

2^1816838 is an apocalyptic number.

1816838 is a deficient number, since it is larger than the sum of its proper divisors (908422).

1816838 is an equidigital number, since it uses as much as digits as its factorization.

1816838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908421.

The product of its digits is 9216, while the sum is 35.

The square root of 1816838 is about 1347.9013317005. The cubic root of 1816838 is about 122.0221674312.

The spelling of 1816838 in words is "one million, eight hundred sixteen thousand, eight hundred thirty-eight".