2166723 has 16 divisors (see below), whose sum is σ = 3457440. Its totient is φ = 1333152.

The previous prime is 2166721. The next prime is 2166763. The reversal of 2166723 is 3276612.

It is a happy number.

It is not a de Polignac number, because 2166723 - 2¹ = 2166721 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a d-powerful number, because it can be written as 2⁷ + 1 + 6³ + 6⁵ + 7⁴ + 2²¹ + 3¹⁰ .

It is not an unprimeable number, because it can be changed into a prime (2166721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2736 + ... + 3437.

It is an arithmetic number, because the mean of its divisors is an integer number (216090).

2^2166723 is an apocalyptic number.

2166723 is a deficient number, since it is larger than the sum of its proper divisors (1290717).

2166723 is a wasteful number, since it uses less digits than its factorization.

2166723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6195 (or 6189 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 2166723 is about 1471.9792797455. The cubic root of 2166723 is about 129.4000560587.

The spelling of 2166723 in words is "two million, one hundred sixty-six thousand, seven hundred twenty-three".