1940547823 has 2 divisors, whose sum is σ = 1940547824. Its totient is φ = 1940547822.

The previous prime is 1940547811. The next prime is 1940547853. The reversal of 1940547823 is 3287450491.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1940547823 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1940547823.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1940547853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 970273911 + 970273912.

It is an arithmetic number, because the mean of its divisors is an integer number (970273912).

Almost surely, 2^1940547823 is an apocalyptic number.

1940547823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1940547823 is an equidigital number, since it uses as much as digits as its factorization.

1940547823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 1940547823 is about 44051.6494923856. The cubic root of 1940547823 is about 1247.3110888597.

The spelling of 1940547823 in words is "one billion, nine hundred forty million, five hundred forty-seven thousand, eight hundred twenty-three".