1811668 has 12 divisors (see below), whose sum is σ = 3256372. Its totient is φ = 881280.

The previous prime is 1811657. The next prime is 1811681. The reversal of 1811668 is 8661181.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1085764 + 725904 = 1042^2 + 852^2 .

It is a plaindrome in base 15.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 5973 + ... + 6268.

2^1811668 is an apocalyptic number.

It is an amenable number.

1811668 is a deficient number, since it is larger than the sum of its proper divisors (1444704).

1811668 is a wasteful number, since it uses less digits than its factorization.

1811668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12282 (or 12280 counting only the distinct ones).

The product of its digits is 2304, while the sum is 31.

The square root of 1811668 is about 1345.9821692727. The cubic root of 1811668 is about 121.9063152491.

It can be divided in two parts, 181 and 1668, that added together give a square (1849 = 43²).

The spelling of 1811668 in words is "one million, eight hundred eleven thousand, six hundred sixty-eight".