2666723 has 4 divisors (see below), whose sum is σ = 2670360. Its totient is φ = 2663088.

The previous prime is 2666717. The next prime is 2666743. The reversal of 2666723 is 3276662.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3276662 = 2 ⋅1638331.

It is a cyclic number.

It is not a de Polignac number, because 2666723 - 2⁶ = 2666659 is a prime.

It is a super-2 number, since 2×2666723² = 14222823117458, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2666723.

It is not an unprimeable number, because it can be changed into a prime (2666743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 290 + ... + 2327.

It is an arithmetic number, because the mean of its divisors is an integer number (667590).

2^2666723 is an apocalyptic number.

2666723 is a deficient number, since it is larger than the sum of its proper divisors (3637).

2666723 is a wasteful number, since it uses less digits than its factorization.

2666723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3636.

The product of its digits is 18144, while the sum is 32.

The square root of 2666723 is about 1633.0104102546. The cubic root of 2666723 is about 138.6732313470.

The spelling of 2666723 in words is "two million, six hundred sixty-six thousand, seven hundred twenty-three".