1806249 has 4 divisors (see below), whose sum is σ = 2408336. Its totient is φ = 1204164.

The previous prime is 1806247. The next prime is 1806251. The reversal of 1806249 is 9426081.

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 an interprime number because it is at equal distance from previous prime (1806247) and next prime (1806251).

It is not a de Polignac number, because 1806249 - 2¹ = 1806247 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1806241) 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 3 ways as a sum of consecutive naturals, for example, 301039 + ... + 301044.

It is an arithmetic number, because the mean of its divisors is an integer number (602084).

2^1806249 is an apocalyptic number.

It is an amenable number.

1806249 is a deficient number, since it is larger than the sum of its proper divisors (602087).

1806249 is an equidigital number, since it uses as much as digits as its factorization.

1806249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602086.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 1806249 is about 1343.9676335388. The cubic root of 1806249 is about 121.7846465099.

The spelling of 1806249 in words is "one million, eight hundred six thousand, two hundred forty-nine".