120813 has 16 divisors (see below), whose sum is σ = 201216. Its totient is φ = 62640.

The previous prime is 120811. The next prime is 120817. The reversal of 120813 is 318021.

It is a happy number.

It is not a de Polignac number, because 120813 - 2¹ = 120811 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 120792 and 120801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120811) 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, 31 + ... + 492.

It is an arithmetic number, because the mean of its divisors is an integer number (12576).

2¹²⁰⁸¹³ is an apocalyptic number.

It is an amenable number.

120813 is a deficient number, since it is larger than the sum of its proper divisors (80403).

120813 is a wasteful number, since it uses less digits than its factorization.

120813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 120813 is about 347.5816450850. The cubic root of 120813 is about 49.4353814508.

Adding to 120813 its reverse (318021), we get a palindrome (438834).

It can be divided in two parts, 1208 and 13, that added together give a palindrome (1221).

The spelling of 120813 in words is "one hundred twenty thousand, eight hundred thirteen".