440247421 has 4 divisors (see below), whose sum is σ = 441029952. Its totient is φ = 439464892.

The previous prime is 440247397. The next prime is 440247427. The reversal of 440247421 is 124742044.

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 not a de Polignac number, because 440247421 - 2²³ = 431858813 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 440247421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440247427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 390421 + ... + 391546.

It is an arithmetic number, because the mean of its divisors is an integer number (110257488).

Almost surely, 2^440247421 is an apocalyptic number.

It is an amenable number.

440247421 is a deficient number, since it is larger than the sum of its proper divisors (782531).

440247421 is an equidigital number, since it uses as much as digits as its factorization.

440247421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782530.

The product of its (nonzero) digits is 7168, while the sum is 28.

The square root of 440247421 is about 20982.0738012237. The cubic root of 440247421 is about 760.7330306353.

Adding to 440247421 its reverse (124742044), we get a palindrome (564989465).

The spelling of 440247421 in words is "four hundred forty million, two hundred forty-seven thousand, four hundred twenty-one".