1801085 has 24 divisors (see below), whose sum is σ = 2569560. Its totient is φ = 1203840.

The previous prime is 1801073. The next prime is 1801091. The reversal of 1801085 is 5801081.

It can be written as a sum of positive squares in 4 ways, for example, as 256036 + 1545049 = 506^2 + 1243^2 .

It is not a de Polignac number, because 1801085 - 2⁶ = 1801021 is a prime.

It is a Curzon number.

It is a plaindrome in base 9.

It is a zygodrome in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 1801085.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7751 + ... + 7979.

It is an arithmetic number, because the mean of its divisors is an integer number (107065).

2^1801085 is an apocalyptic number.

It is an amenable number.

1801085 is a deficient number, since it is larger than the sum of its proper divisors (768475).

1801085 is a wasteful number, since it uses less digits than its factorization.

1801085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269 (or 258 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 23.

The square root of 1801085 is about 1342.0450812100. The cubic root of 1801085 is about 121.6684764435.

The spelling of 1801085 in words is "one million, eight hundred one thousand, eighty-five".