1811142 has 24 divisors (see below), whose sum is σ = 3949920. Its totient is φ = 599760.

The previous prime is 1811141. The next prime is 1811167. The reversal of 1811142 is 2411181.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4092 + ... + 4512.

It is an arithmetic number, because the mean of its divisors is an integer number (164580).

2^1811142 is an apocalyptic number.

1811142 is an abundant number, since it is smaller than the sum of its proper divisors (2138778).

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

1811142 is a wasteful number, since it uses less digits than its factorization.

1811142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668 (or 665 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

The square root of 1811142 is about 1345.7867587400. The cubic root of 1811142 is about 121.8945160069.

It can be divided in two parts, 1811 and 142, that added together give a triangular number (1953 = T₆₂).

The spelling of 1811142 in words is "one million, eight hundred eleven thousand, one hundred forty-two".