2155723 has 2 divisors, whose sum is σ = 2155724. Its totient is φ = 2155722.

The previous prime is 2155717. The next prime is 2155733. The reversal of 2155723 is 3275512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2155723 - 2⁵ = 2155691 is a prime.

It is not a weakly prime, because it can be changed into another prime (2155733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077861 + 1077862.

It is an arithmetic number, because the mean of its divisors is an integer number (1077862).

2^2155723 is an apocalyptic number.

2155723 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155723 is an equidigital number, since it uses as much as digits as its factorization.

2155723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2100, while the sum is 25.

The square root of 2155723 is about 1468.2380597165. The cubic root of 2155723 is about 129.1807054229.

The spelling of 2155723 in words is "two million, one hundred fifty-five thousand, seven hundred twenty-three".