1820866 has 8 divisors (see below), whose sum is σ = 2769984. Its totient is φ = 897540.

The previous prime is 1820857. The next prime is 1820869. The reversal of 1820866 is 6680281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1820869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6270 + ... + 6553.

It is an arithmetic number, because the mean of its divisors is an integer number (346248).

2^1820866 is an apocalyptic number.

1820866 is a deficient number, since it is larger than the sum of its proper divisors (949118).

1820866 is a wasteful number, since it uses less digits than its factorization.

1820866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12896.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 1820866 is about 1349.3946791062. The cubic root of 1820866 is about 122.1122768243.

The spelling of 1820866 in words is "one million, eight hundred twenty thousand, eight hundred sixty-six".