2157723 has 12 divisors (see below), whose sum is σ = 3183648. Its totient is φ = 1407600.

The previous prime is 2157721. The next prime is 2157731. The reversal of 2157723 is 3277512.

2157723 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2157723 - 2¹ = 2157721 is a prime.

2157723 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2157721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2128 + ... + 2973.

It is an arithmetic number, because the mean of its divisors is an integer number (265304).

2^2157723 is an apocalyptic number.

2157723 is a deficient number, since it is larger than the sum of its proper divisors (1025925).

2157723 is a wasteful number, since it uses less digits than its factorization.

2157723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5154 (or 5151 counting only the distinct ones).

The product of its digits is 2940, while the sum is 27.

The square root of 2157723 is about 1468.9189902782. The cubic root of 2157723 is about 129.2206427668.

The spelling of 2157723 in words is "two million, one hundred fifty-seven thousand, seven hundred twenty-three".