840663 has 6 divisors (see below), whose sum is σ = 1214304. Its totient is φ = 560436.

The previous prime is 840661. The next prime is 840683. The reversal of 840663 is 366048.

It is not a de Polignac number, because 840663 - 2¹ = 840661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 46695 + ... + 46712.

It is an arithmetic number, because the mean of its divisors is an integer number (202384).

2⁸⁴⁰⁶⁶³ is an apocalyptic number.

840663 is a deficient number, since it is larger than the sum of its proper divisors (373641).

840663 is a wasteful number, since it uses less digits than its factorization.

840663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93413 (or 93410 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 840663 is about 916.8767638020. The cubic root of 840663 is about 94.3786971345.

The spelling of 840663 in words is "eight hundred forty thousand, six hundred sixty-three".