840900287 has 2 divisors, whose sum is σ = 840900288. Its totient is φ = 840900286.

The previous prime is 840900259. The next prime is 840900349. The reversal of 840900287 is 782009048.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 840900287 - 2⁸ = 840900031 is a prime.

It is a super-2 number, since 2×840900287² = 1414226585353364738, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 840900287.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840900587) 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, 420450143 + 420450144.

It is an arithmetic number, because the mean of its divisors is an integer number (420450144).

Almost surely, 2^840900287 is an apocalyptic number.

840900287 is a deficient number, since it is larger than the sum of its proper divisors (1).

840900287 is an equidigital number, since it uses as much as digits as its factorization.

840900287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 840900287 is about 28998.2807593830. The cubic root of 840900287 is about 943.8757613089.

The spelling of 840900287 in words is "eight hundred forty million, nine hundred thousand, two hundred eighty-seven".