1811138 has 12 divisors (see below), whose sum is σ = 3160422. Its totient is φ = 776160.

The previous prime is 1811119. The next prime is 1811141. The reversal of 1811138 is 8311181.

It can be written as a sum of positive squares in only one way, i.e., 1117249 + 693889 = 1057^2 + 833^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9143 + ... + 9338.

2^1811138 is an apocalyptic number.

1811138 is a deficient number, since it is larger than the sum of its proper divisors (1349284).

1811138 is a wasteful number, since it uses less digits than its factorization.

1811138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18497 (or 18490 counting only the distinct ones).

The product of its digits is 192, while the sum is 23.

The square root of 1811138 is about 1345.7852726197. The cubic root of 1811138 is about 121.8944262700.

The spelling of 1811138 in words is "one million, eight hundred eleven thousand, one hundred thirty-eight".