1662866 has 4 divisors (see below), whose sum is σ = 2494302. Its totient is φ = 831432.

The previous prime is 1662863. The next prime is 1662883. The reversal of 1662866 is 6682661.

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., 1525225 + 137641 = 1235^2 + 371^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1662863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415715 + ... + 415718.

2^1662866 is an apocalyptic number.

1662866 is a deficient number, since it is larger than the sum of its proper divisors (831436).

1662866 is an equidigital number, since it uses as much as digits as its factorization.

1662866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831435.

The product of its digits is 20736, while the sum is 35.

The square root of 1662866 is about 1289.5216167246. The cubic root of 1662866 is about 118.4729177845.

The spelling of 1662866 in words is "one million, six hundred sixty-two thousand, eight hundred sixty-six".