2666786 has 4 divisors (see below), whose sum is σ = 4000182. Its totient is φ = 1333392.

The previous prime is 2666779. The next prime is 2666791. The reversal of 2666786 is 6876662.

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., 1890625 + 776161 = 1375^2 + 881^2 .

It is a super-2 number, since 2×2666786² = 14223495139592, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 666695 + ... + 666698.

2^2666786 is an apocalyptic number.

2666786 is a deficient number, since it is larger than the sum of its proper divisors (1333396).

2666786 is a wasteful number, since it uses less digits than its factorization.

2666786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333395.

The product of its digits is 145152, while the sum is 41.

The square root of 2666786 is about 1633.0296996687. The cubic root of 2666786 is about 138.6743233671.

The spelling of 2666786 in words is "two million, six hundred sixty-six thousand, seven hundred eighty-six".