840727423 has 2 divisors, whose sum is σ = 840727424. Its totient is φ = 840727422.

The previous prime is 840727397. The next prime is 840727451. The reversal of 840727423 is 324727048.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-840727423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840727483) 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, 420363711 + 420363712.

It is an arithmetic number, because the mean of its divisors is an integer number (420363712).

Almost surely, 2^840727423 is an apocalyptic number.

840727423 is a deficient number, since it is larger than the sum of its proper divisors (1).

840727423 is an equidigital number, since it uses as much as digits as its factorization.

840727423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75264, while the sum is 37.

The square root of 840727423 is about 28995.3000156922. The cubic root of 840727423 is about 943.8110793152.

The spelling of 840727423 in words is "eight hundred forty million, seven hundred twenty-seven thousand, four hundred twenty-three".