1805245 has 8 divisors (see below), whose sum is σ = 2333016. Its totient is φ = 1333056.

The previous prime is 1805239. The next prime is 1805261. The reversal of 1805245 is 5425081.

It can be written as a sum of positive squares in 4 ways, for example, as 68121 + 1737124 = 261^2 + 1318^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1805245 - 2⁷ = 1805117 is a prime.

It is a Duffinian number.

1805245 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13822 + ... + 13951.

It is an arithmetic number, because the mean of its divisors is an integer number (291627).

2^1805245 is an apocalyptic number.

It is an amenable number.

1805245 is a deficient number, since it is larger than the sum of its proper divisors (527771).

1805245 is a wasteful number, since it uses less digits than its factorization.

1805245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27791.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 1805245 is about 1343.5940607192. The cubic root of 1805245 is about 121.7620777413.

It can be divided in two parts, 1805 and 245, that multiplied together give a square (442225 = 665²).

The spelling of 1805245 in words is "one million, eight hundred five thousand, two hundred forty-five".