2145823 has 2 divisors, whose sum is σ = 2145824. Its totient is φ = 2145822.

The previous prime is 2145821. The next prime is 2145827. The reversal of 2145823 is 3285412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2145823 - 2¹ = 2145821 is a prime.

Together with 2145821, it forms a pair of twin primes.

It is a d-powerful number, because it can be written as 2¹¹ + 1 + 4² + 5⁹ + 8³ + 2¹⁷ + 3¹⁰ .

2145823 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2145821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072911 + 1072912.

It is an arithmetic number, because the mean of its divisors is an integer number (1072912).

2^2145823 is an apocalyptic number.

2145823 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145823 is an equidigital number, since it uses as much as digits as its factorization.

2145823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 25.

The square root of 2145823 is about 1464.8627922096. The cubic root of 2145823 is about 128.9826509529.

The spelling of 2145823 in words is "two million, one hundred forty-five thousand, eight hundred twenty-three".