2157323 has 6 divisors (see below), whose sum is σ = 2509596. Its totient is φ = 1849092.

The previous prime is 2157319. The next prime is 2157329. The reversal of 2157323 is 3237512.

It is not a de Polignac number, because 2157323 - 2² = 2157319 is a prime.

It is a d-powerful number, because it can be written as 2¹¹ + 1 + 5⁹ + 7⁵ + 3 + 2¹³ + 3¹¹ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2157329) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21965 + ... + 22062.

It is an arithmetic number, because the mean of its divisors is an integer number (418266).

2^2157323 is an apocalyptic number.

2157323 is a deficient number, since it is larger than the sum of its proper divisors (352273).

2157323 is an equidigital number, since it uses as much as digits as its factorization.

2157323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44041 (or 44034 counting only the distinct ones).

The product of its digits is 1260, while the sum is 23.

The square root of 2157323 is about 1468.7828294203. The cubic root of 2157323 is about 129.2126572729.

The spelling of 2157323 in words is "two million, one hundred fifty-seven thousand, three hundred twenty-three".