1809144 has 24 divisors (see below), whose sum is σ = 4899960. Its totient is φ = 603024.

The previous prime is 1809133. The next prime is 1809149. The reversal of 1809144 is 4419081.

1809144 is nontrivially palindromic in base 5.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1809149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12492 + ... + 12635.

It is an arithmetic number, because the mean of its divisors is an integer number (204165).

2^1809144 is an apocalyptic number.

It is an amenable number.

1809144 is an abundant number, since it is smaller than the sum of its proper divisors (3090816).

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

1809144 is a wasteful number, since it uses less digits than its factorization.

1809144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25139 (or 25132 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 1809144 is about 1345.0442371907. The cubic root of 1809144 is about 121.8496760007.

It can be divided in two parts, 1809 and 144, that added together give a triangular number (1953 = T₆₂).

The spelling of 1809144 in words is "one million, eight hundred nine thousand, one hundred forty-four".