1210666 has 4 divisors (see below), whose sum is σ = 1816002. Its totient is φ = 605332.

The previous prime is 1210639. The next prime is 1210711. The reversal of 1210666 is 6660121.

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., 616225 + 594441 = 785^2 + 771^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 302665 + ... + 302668.

2^1210666 is an apocalyptic number.

1210666 is a deficient number, since it is larger than the sum of its proper divisors (605336).

1210666 is an equidigital number, since it uses as much as digits as its factorization.

1210666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605335.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1210666 is about 1100.3026856279. The cubic root of 1210666 is about 106.5797708095.

Adding to 1210666 its reverse (6660121), we get a palindrome (7870787).

The spelling of 1210666 in words is "one million, two hundred ten thousand, six hundred sixty-six".