1809801 has 24 divisors (see below), whose sum is σ = 3120000. Its totient is φ = 988416.

The previous prime is 1809799. The next prime is 1809823. The reversal of 1809801 is 1089081.

It is not a de Polignac number, because 1809801 - 2¹ = 1809799 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1809851) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 825 + ... + 2073.

It is an arithmetic number, because the mean of its divisors is an integer number (130000).

2^1809801 is an apocalyptic number.

It is an amenable number.

1809801 is a deficient number, since it is larger than the sum of its proper divisors (1310199).

1809801 is a wasteful number, since it uses less digits than its factorization.

1809801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285 (or 1282 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The square root of 1809801 is about 1345.2884449069. The cubic root of 1809801 is about 121.8644243289.

The spelling of 1809801 in words is "one million, eight hundred nine thousand, eight hundred one".