1801285 has 4 divisors (see below), whose sum is σ = 2161548. Its totient is φ = 1441024.

The previous prime is 1801273. The next prime is 1801297. The reversal of 1801285 is 5821081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5821081 = 7 ⋅831583.

It is an interprime number because it is at equal distance from previous prime (1801273) and next prime (1801297).

It can be written as a sum of positive squares in 2 ways, for example, as 1256641 + 544644 = 1121^2 + 738^2 .

It is a cyclic number.

It is not a de Polignac number, because 1801285 - 2¹⁵ = 1768517 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180124 + ... + 180133.

It is an arithmetic number, because the mean of its divisors is an integer number (540387).

2^1801285 is an apocalyptic number.

It is an amenable number.

1801285 is a deficient number, since it is larger than the sum of its proper divisors (360263).

1801285 is an equidigital number, since it uses as much as digits as its factorization.

1801285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360262.

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 1801285 is about 1342.1195922868. The cubic root of 1801285 is about 121.6729798021.

The spelling of 1801285 in words is "one million, eight hundred one thousand, two hundred eighty-five".