840120 has 32 divisors (see below), whose sum is σ = 2520720. Its totient is φ = 224000.

The previous prime is 840109. The next prime is 840137. The reversal of 840120 is 21048.

840120 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×840120² = 1411603228800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 840120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3381 + ... + 3620.

2⁸⁴⁰¹²⁰ is an apocalyptic number.

It is an amenable number.

840120 is an abundant number, since it is smaller than the sum of its proper divisors (1680600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

840120 is a wasteful number, since it uses less digits than its factorization.

840120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7015 (or 7011 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 840120 is about 916.5806020204. The cubic root of 840120 is about 94.3583724343.

Adding to 840120 its reverse (21048), we get a palindrome (861168).

The spelling of 840120 in words is "eight hundred forty thousand, one hundred twenty".