2113823 has 2 divisors, whose sum is σ = 2113824. Its totient is φ = 2113822.

The previous prime is 2113819. The next prime is 2113843. The reversal of 2113823 is 3283112.

It is an a-pointer prime, because the next prime (2113843) can be obtained adding 2113823 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2113823 - 2² = 2113819 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2113795 and 2113804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2113843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1056911 + 1056912.

It is an arithmetic number, because the mean of its divisors is an integer number (1056912).

2^2113823 is an apocalyptic number.

2113823 is a deficient number, since it is larger than the sum of its proper divisors (1).

2113823 is an equidigital number, since it uses as much as digits as its factorization.

2113823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 20.

The square root of 2113823 is about 1453.8992399750. The cubic root of 2113823 is about 128.3382775779.

Adding to 2113823 its reverse (3283112), we get a palindrome (5396935).

The spelling of 2113823 in words is "two million, one hundred thirteen thousand, eight hundred twenty-three".