440448389 has 4 divisors (see below), whose sum is σ = 441314220. Its totient is φ = 439582560.

The previous prime is 440448377. The next prime is 440448397. The reversal of 440448389 is 983844044.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 166281025 + 274167364 = 12895^2 + 16558^2 .

It is a cyclic number.

It is not a de Polignac number, because 440448389 - 2⁴ = 440448373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440448989) 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, 432152 + ... + 433169.

It is an arithmetic number, because the mean of its divisors is an integer number (110328555).

Almost surely, 2^440448389 is an apocalyptic number.

It is an amenable number.

440448389 is a deficient number, since it is larger than the sum of its proper divisors (865831).

440448389 is an equidigital number, since it uses as much as digits as its factorization.

440448389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865830.

The product of its (nonzero) digits is 442368, while the sum is 44.

The square root of 440448389 is about 20986.8622952551. The cubic root of 440448389 is about 760.8487683857.

The spelling of 440448389 in words is "four hundred forty million, four hundred forty-eight thousand, three hundred eighty-nine".