1808145 has 24 divisors (see below), whose sum is σ = 3272256. Its totient is φ = 921888.

The previous prime is 1808119. The next prime is 1808161. The reversal of 1808145 is 5418081.

It is not a de Polignac number, because 1808145 - 2⁷ = 1808017 is a prime.

1808145 is a lucky number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 162 + ... + 1908.

It is an arithmetic number, because the mean of its divisors is an integer number (136344).

2^1808145 is an apocalyptic number.

1808145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1808145 is a deficient number, since it is larger than the sum of its proper divisors (1464111).

1808145 is a wasteful number, since it uses less digits than its factorization.

1808145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1781 (or 1778 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 1808145 is about 1344.6728226598. The cubic root of 1808145 is about 121.8272436167.

It can be divided in two parts, 1808 and 145, that added together give a triangular number (1953 = T₆₂).

The spelling of 1808145 in words is "one million, eight hundred eight thousand, one hundred forty-five".