1812238 has 4 divisors (see below), whose sum is σ = 2718360. Its totient is φ = 906118.

The previous prime is 1812233. The next prime is 1812263. The reversal of 1812238 is 8322181.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1812233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 453058 + ... + 453061.

It is an arithmetic number, because the mean of its divisors is an integer number (679590).

2^1812238 is an apocalyptic number.

1812238 is a deficient number, since it is larger than the sum of its proper divisors (906122).

1812238 is an equidigital number, since it uses as much as digits as its factorization.

1812238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906121.

The product of its digits is 768, while the sum is 25.

The square root of 1812238 is about 1346.1938939098. The cubic root of 1812238 is about 121.9190989220.

The spelling of 1812238 in words is "one million, eight hundred twelve thousand, two hundred thirty-eight".