1810120 has 48 divisors (see below), whose sum is σ = 4461660. Its totient is φ = 657024.

The previous prime is 1810097. The next prime is 1810129. The reversal of 1810120 is 210181.

It can be written as a sum of positive squares in 2 ways, for example, as 1684804 + 125316 = 1298^2 + 354^2 .

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a self number, because there is not a number n which added to its sum of digits gives 1810120.

It is not an unprimeable number, because it can be changed into a prime (1810129) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30651 + ... + 30709.

2^1810120 is an apocalyptic number.

1810120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1810120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2230830).

1810120 is an abundant number, since it is smaller than the sum of its proper divisors (2651540).

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

1810120 is a wasteful number, since it uses less digits than its factorization.

1810120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142 (or 79 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1810120 is about 1345.4070016170. The cubic root of 1810120 is about 121.8715839498.

The spelling of 1810120 in words is "one million, eight hundred ten thousand, one hundred twenty".