1809159 has 16 divisors (see below), whose sum is σ = 2671104. Its totient is φ = 1080000.

The previous prime is 1809149. The next prime is 1809163. The reversal of 1809159 is 9519081.

It is a de Polignac number, because none of the positive numbers 2^k-1809159 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2034 + ... + 2784.

It is an arithmetic number, because the mean of its divisors is an integer number (166944).

2^1809159 is an apocalyptic number.

1809159 is a deficient number, since it is larger than the sum of its proper divisors (861945).

1809159 is a wasteful number, since it uses less digits than its factorization.

1809159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838.

The product of its (nonzero) digits is 3240, while the sum is 33.

The square root of 1809159 is about 1345.0498132040. The cubic root of 1809159 is about 121.8500127604.

It can be divided in two parts, 180 and 9159, that added together give a palindrome (9339).

The spelling of 1809159 in words is "one million, eight hundred nine thousand, one hundred fifty-nine".