215723 has 2 divisors, whose sum is σ = 215724. Its totient is φ = 215722.

The previous prime is 215693. The next prime is 215737. The reversal of 215723 is 327512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215723 - 2⁶ = 215659 is a prime.

It is a Sophie Germain prime.

It is a plaindrome in base 14 and base 16.

It is a junction number, because it is equal to n+sod(n) for n = 215695 and 215704.

It is not a weakly prime, because it can be changed into another prime (215753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107861 + 107862.

It is an arithmetic number, because the mean of its divisors is an integer number (107862).

2²¹⁵⁷²³ is an apocalyptic number.

215723 is a deficient number, since it is larger than the sum of its proper divisors (1).

215723 is an equidigital number, since it uses as much as digits as its factorization.

215723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 420, while the sum is 20.

The square root of 215723 is about 464.4599013909. The cubic root of 215723 is about 59.9743408802.

The spelling of 215723 in words is "two hundred fifteen thousand, seven hundred twenty-three".