440912809 has 4 divisors (see below), whose sum is σ = 440969040. Its totient is φ = 440856580.

The previous prime is 440912767. The next prime is 440912827. The reversal of 440912809 is 908219044.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-440912809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (440912869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13987 + ... + 32824.

It is an arithmetic number, because the mean of its divisors is an integer number (110242260).

Almost surely, 2^440912809 is an apocalyptic number.

It is an amenable number.

440912809 is a deficient number, since it is larger than the sum of its proper divisors (56231).

440912809 is an equidigital number, since it uses as much as digits as its factorization.

440912809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56230.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 440912809 is about 20997.9239211880. The cubic root of 440912809 is about 761.1160938898.

The spelling of 440912809 in words is "four hundred forty million, nine hundred twelve thousand, eight hundred nine".