840246287 has 2 divisors, whose sum is σ = 840246288. Its totient is φ = 840246286.

The previous prime is 840246247. The next prime is 840246299. The reversal of 840246287 is 782642048.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 840246287 - 2⁸ = 840246031 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840246217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420123143 + 420123144.

It is an arithmetic number, because the mean of its divisors is an integer number (420123144).

Almost surely, 2^840246287 is an apocalyptic number.

840246287 is a deficient number, since it is larger than the sum of its proper divisors (1).

840246287 is an equidigital number, since it uses as much as digits as its factorization.

840246287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172032, while the sum is 41.

The square root of 840246287 is about 28987.0020353951. The cubic root of 840246287 is about 943.6310018696.

The spelling of 840246287 in words is "eight hundred forty million, two hundred forty-six thousand, two hundred eighty-seven".