1811020 has 48 divisors (see below), whose sum is σ = 4128768. Its totient is φ = 665280.

The previous prime is 1810999. The next prime is 1811041. The reversal of 1811020 is 201181.

It is an interprime number because it is at equal distance from previous prime (1810999) and next prime (1811041).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14197 + ... + 14323.

It is an arithmetic number, because the mean of its divisors is an integer number (86016).

2^1811020 is an apocalyptic number.

1811020 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 1811020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2064384).

1811020 is an abundant number, since it is smaller than the sum of its proper divisors (2317748).

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

1811020 is a wasteful number, since it uses less digits than its factorization.

1811020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190 (or 188 counting only the distinct ones).

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

The square root of 1811020 is about 1345.7414313307. The cubic root of 1811020 is about 121.8917789741.

The spelling of 1811020 in words is "one million, eight hundred eleven thousand, twenty".