1811140 has 24 divisors (see below), whose sum is σ = 3836952. Its totient is φ = 718080.

The previous prime is 1811119. The next prime is 1811141. The reversal of 1811140 is 411181.

It can be written as a sum of positive squares in 4 ways, for example, as 451584 + 1359556 = 672^2 + 1166^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1811141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2410 + ... + 3070.

It is an arithmetic number, because the mean of its divisors is an integer number (159873).

2^1811140 is an apocalyptic number.

1811140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1811140 is an abundant number, since it is smaller than the sum of its proper divisors (2025812).

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

1811140 is a wasteful number, since it uses less digits than its factorization.

1811140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807 (or 805 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

The square root of 1811140 is about 1345.7860156801. The cubic root of 1811140 is about 121.8944711385.

The spelling of 1811140 in words is "one million, eight hundred eleven thousand, one hundred forty".