1802109 has 4 divisors (see below), whose sum is σ = 2402816. Its totient is φ = 1201404.

The previous prime is 1802107. The next prime is 1802113. The reversal of 1802109 is 9012081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1802109 - 2¹ = 1802107 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1802107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 300349 + ... + 300354.

It is an arithmetic number, because the mean of its divisors is an integer number (600704).

2^1802109 is an apocalyptic number.

It is an amenable number.

1802109 is a deficient number, since it is larger than the sum of its proper divisors (600707).

1802109 is an equidigital number, since it uses as much as digits as its factorization.

1802109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600706.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 1802109 is about 1342.4265343027. The cubic root of 1802109 is about 121.6915301243.

The spelling of 1802109 in words is "one million, eight hundred two thousand, one hundred nine".