1812147806 has 16 divisors (see below), whose sum is σ = 3107097600. Its totient is φ = 776495160.

The previous prime is 1812147803. The next prime is 1812147823. The reversal of 1812147806 is 6087412181.

It is a happy number.

It is a super-2 number, since 2×1812147806² = 6567759341581227272, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1812147806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1812147803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121751 + ... + 135821.

It is an arithmetic number, because the mean of its divisors is an integer number (194193600).

Almost surely, 2^1812147806 is an apocalyptic number.

1812147806 is a deficient number, since it is larger than the sum of its proper divisors (1294949794).

1812147806 is a wasteful number, since it uses less digits than its factorization.

1812147806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23279.

The product of its (nonzero) digits is 21504, while the sum is 38.

The square root of 1812147806 is about 42569.3294051010. The cubic root of 1812147806 is about 1219.1707627493.

Adding to 1812147806 its reverse (6087412181), we get a palindrome (7899559987).

The spelling of 1812147806 in words is "one billion, eight hundred twelve million, one hundred forty-seven thousand, eight hundred six".