840123 has 24 divisors (see below), whose sum is σ = 1357200. Its totient is φ = 499392.

The previous prime is 840109. The next prime is 840137. The reversal of 840123 is 321048.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (840109) and next prime (840137).

It is not a de Polignac number, because 840123 - 2⁹ = 839611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 840096 and 840105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840163) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44208 + ... + 44226.

It is an arithmetic number, because the mean of its divisors is an integer number (56550).

2⁸⁴⁰¹²³ is an apocalyptic number.

840123 is a deficient number, since it is larger than the sum of its proper divisors (517077).

840123 is a wasteful number, since it uses less digits than its factorization.

840123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76 (or 39 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 840123 is about 916.5822385362. The cubic root of 840123 is about 94.3584847495.

The spelling of 840123 in words is "eight hundred forty thousand, one hundred twenty-three".