1812842 has 4 divisors (see below), whose sum is σ = 2719266. Its totient is φ = 906420.

The previous prime is 1812827. The next prime is 1812851. The reversal of 1812842 is 2482181.

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., 1661521 + 151321 = 1289^2 + 389^2 .

It is a super-2 number, since 2×1812842² = 6572792233928, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 453209 + ... + 453212.

2^1812842 is an apocalyptic number.

1812842 is a deficient number, since it is larger than the sum of its proper divisors (906424).

1812842 is an equidigital number, since it uses as much as digits as its factorization.

1812842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906423.

The product of its digits is 1024, while the sum is 26.

The square root of 1812842 is about 1346.4182114039. The cubic root of 1812842 is about 121.9326422050.

The spelling of 1812842 in words is "one million, eight hundred twelve thousand, eight hundred forty-two".