2089666 has 4 divisors (see below), whose sum is σ = 3134502. Its totient is φ = 1044832.

The previous prime is 2089651. The next prime is 2089669. The reversal of 2089666 is 6669802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6669802 = 2 ⋅3334901.

It can be written as a sum of positive squares in only one way, i.e., 1946025 + 143641 = 1395^2 + 379^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2089669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 522415 + ... + 522418.

2^2089666 is an apocalyptic number.

2089666 is a deficient number, since it is larger than the sum of its proper divisors (1044836).

2089666 is a wasteful number, since it uses less digits than its factorization.

2089666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044835.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 2089666 is about 1445.5677085491. The cubic root of 2089666 is about 127.8475153594.

Adding to 2089666 its product of nonzero digits (31104), we get a triangular number (2120770 = T₂₀₅₉).

The spelling of 2089666 in words is "two million, eighty-nine thousand, six hundred sixty-six".