2190823 has 2 divisors, whose sum is σ = 2190824. Its totient is φ = 2190822.

The previous prime is 2190821. The next prime is 2190829. The reversal of 2190823 is 3280912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2190823 - 2¹ = 2190821 is a prime.

Together with 2190821, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2190821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095411 + 1095412.

It is an arithmetic number, because the mean of its divisors is an integer number (1095412).

2^2190823 is an apocalyptic number.

2190823 is a deficient number, since it is larger than the sum of its proper divisors (1).

2190823 is an equidigital number, since it uses as much as digits as its factorization.

2190823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 2190823 is about 1480.1428985068. The cubic root of 2190823 is about 129.8780513202.

The spelling of 2190823 in words is "two million, one hundred ninety thousand, eight hundred twenty-three".