840385223 has 2 divisors, whose sum is σ = 840385224. Its totient is φ = 840385222.

The previous prime is 840385211. The next prime is 840385253. The reversal of 840385223 is 322583048.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 840385223 - 2⁴ = 840385207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840385253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420192611 + 420192612.

It is an arithmetic number, because the mean of its divisors is an integer number (420192612).

Almost surely, 2^840385223 is an apocalyptic number.

840385223 is a deficient number, since it is larger than the sum of its proper divisors (1).

840385223 is an equidigital number, since it uses as much as digits as its factorization.

840385223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46080, while the sum is 35.

The square root of 840385223 is about 28989.3984587469. The cubic root of 840385223 is about 943.6830092764.

The spelling of 840385223 in words is "eight hundred forty million, three hundred eighty-five thousand, two hundred twenty-three".