1109666 has 4 divisors (see below), whose sum is σ = 1664502. Its totient is φ = 554832.

The previous prime is 1109663. The next prime is 1109723. The reversal of 1109666 is 6669011.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6669011 = 23 ⋅289957.

It can be written as a sum of positive squares in only one way, i.e., 714025 + 395641 = 845^2 + 629^2 .

It is not an unprimeable number, because it can be changed into a prime (1109663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 277415 + ... + 277418.

2^1109666 is an apocalyptic number.

1109666 is a deficient number, since it is larger than the sum of its proper divisors (554836).

1109666 is an equidigital number, since it uses as much as digits as its factorization.

1109666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554835.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 1109666 is about 1053.4068539743. The cubic root of 1109666 is about 103.5294944219.

The spelling of 1109666 in words is "one million, one hundred nine thousand, six hundred sixty-six".