40011823 has 2 divisors, whose sum is σ = 40011824. Its totient is φ = 40011822.

The previous prime is 40011781. The next prime is 40011827. The reversal of 40011823 is 32811004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40011823 - 2⁹ = 40011311 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40011823.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40011827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20005911 + 20005912.

It is an arithmetic number, because the mean of its divisors is an integer number (20005912).

Almost surely, 2^40011823 is an apocalyptic number.

40011823 is a deficient number, since it is larger than the sum of its proper divisors (1).

40011823 is an equidigital number, since it uses as much as digits as its factorization.

40011823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 40011823 is about 6325.4899414986. The cubic root of 40011823 is about 342.0288810921.

Adding to 40011823 its reverse (32811004), we get a palindrome (72822827).

The spelling of 40011823 in words is "forty million, eleven thousand, eight hundred twenty-three".