1812422 has 4 divisors (see below), whose sum is σ = 2718636. Its totient is φ = 906210.

The previous prime is 1812409. The next prime is 1812431. The reversal of 1812422 is 2242181.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2242181 = 17 ⋅131893.

It is a junction number, because it is equal to n+sod(n) for n = 1812394 and 1812403.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 453104 + ... + 453107.

It is an arithmetic number, because the mean of its divisors is an integer number (679659).

2^1812422 is an apocalyptic number.

1812422 is a deficient number, since it is larger than the sum of its proper divisors (906214).

1812422 is an equidigital number, since it uses as much as digits as its factorization.

1812422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906213.

The product of its digits is 256, while the sum is 20.

The square root of 1812422 is about 1346.2622329992. The cubic root of 1812422 is about 121.9232250090.

The spelling of 1812422 in words is "one million, eight hundred twelve thousand, four hundred twenty-two".