1220866 has 8 divisors (see below), whose sum is σ = 1854720. Its totient is φ = 602628.

The previous prime is 1220839. The next prime is 1220893. The reversal of 1220866 is 6680221.

It is an interprime number because it is at equal distance from previous prime (1220839) and next prime (1220893).

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

It is a self number, because there is not a number n which added to its sum of digits gives 1220866.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3706 + ... + 4021.

It is an arithmetic number, because the mean of its divisors is an integer number (231840).

2^1220866 is an apocalyptic number.

1220866 is a deficient number, since it is larger than the sum of its proper divisors (633854).

1220866 is an equidigital number, since it uses as much as digits as its factorization.

1220866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7808.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1220866 is about 1104.9280519563. The cubic root of 1220866 is about 106.8782497330.

The spelling of 1220866 in words is "one million, two hundred twenty thousand, eight hundred sixty-six".