440001809 has 6 divisors (see below), whose sum is σ = 476451846. Its totient is φ = 406155360.

The previous prime is 440001761. The next prime is 440001811. The reversal of 440001809 is 908100044.

It can be written as a sum of positive squares in 3 ways, for example, as 25472209 + 414529600 = 5047^2 + 20360^2 .

It is a de Polignac number, because none of the positive numbers 2^k-440001809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (440001209) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1301612 + ... + 1301949.

It is an arithmetic number, because the mean of its divisors is an integer number (79408641).

Almost surely, 2^440001809 is an apocalyptic number.

It is an amenable number.

440001809 is a deficient number, since it is larger than the sum of its proper divisors (36450037).

440001809 is a wasteful number, since it uses less digits than its factorization.

440001809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2603587 (or 2603574 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 440001809 is about 20976.2200837043. The cubic root of 440001809 is about 760.5915345055.

The spelling of 440001809 in words is "four hundred forty million, one thousand, eight hundred nine".