840581923 has 2 divisors, whose sum is σ = 840581924. Its totient is φ = 840581922.

The previous prime is 840581899. The next prime is 840581953. The reversal of 840581923 is 329185048.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 840581923 - 2¹³ = 840573731 is a prime.

It is not a weakly prime, because it can be changed into another prime (840581953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420290961 + 420290962.

It is an arithmetic number, because the mean of its divisors is an integer number (420290962).

Almost surely, 2^840581923 is an apocalyptic number.

840581923 is a deficient number, since it is larger than the sum of its proper divisors (1).

840581923 is an equidigital number, since it uses as much as digits as its factorization.

840581923 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 840581923 is about 28992.7908798032. The cubic root of 840581923 is about 943.7566294697.

The spelling of 840581923 in words is "eight hundred forty million, five hundred eighty-one thousand, nine hundred twenty-three".