840623 has 16 divisors (see below), whose sum is σ = 1028160. Its totient is φ = 672000.

The previous prime is 840611. The next prime is 840643. The reversal of 840623 is 326048.

It is a happy number.

It is not a de Polignac number, because 840623 - 2¹⁰ = 839599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840643) 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 15 ways as a sum of consecutive naturals, for example, 8273 + ... + 8373.

It is an arithmetic number, because the mean of its divisors is an integer number (64260).

2⁸⁴⁰⁶²³ is an apocalyptic number.

840623 is a deficient number, since it is larger than the sum of its proper divisors (187537).

840623 is a wasteful number, since it uses less digits than its factorization.

840623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 840623 is about 916.8549503602. The cubic root of 840623 is about 94.3772002177.

The spelling of 840623 in words is "eight hundred forty thousand, six hundred twenty-three".