1813947823 has 2 divisors, whose sum is σ = 1813947824. Its totient is φ = 1813947822.

The previous prime is 1813947769. The next prime is 1813947833. The reversal of 1813947823 is 3287493181.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1813947823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1813947833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906973911 + 906973912.

It is an arithmetic number, because the mean of its divisors is an integer number (906973912).

Almost surely, 2^1813947823 is an apocalyptic number.

1813947823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1813947823 is an equidigital number, since it uses as much as digits as its factorization.

1813947823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 46.

The square root of 1813947823 is about 42590.4663393112. The cubic root of 1813947823 is about 1219.5742989803.

The spelling of 1813947823 in words is "one billion, eight hundred thirteen million, nine hundred forty-seven thousand, eight hundred twenty-three".