440243421 has 4 divisors (see below), whose sum is σ = 586991232. Its totient is φ = 293495612.

The previous prime is 440243413. The next prime is 440243429. The reversal of 440243421 is 124342044.

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 an interprime number because it is at equal distance from previous prime (440243413) and next prime (440243429).

It is a cyclic number.

It is not a de Polignac number, because 440243421 - 2³ = 440243413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 440243391 and 440243400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440243429) 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, 73373901 + ... + 73373906.

It is an arithmetic number, because the mean of its divisors is an integer number (146747808).

Almost surely, 2^440243421 is an apocalyptic number.

It is an amenable number.

440243421 is a deficient number, since it is larger than the sum of its proper divisors (146747811).

440243421 is a wasteful number, since it uses less digits than its factorization.

440243421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146747810.

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 440243421 is about 20981.9784815446. The cubic root of 440243421 is about 760.7307266722.

Adding to 440243421 its reverse (124342044), we get a palindrome (564585465).

The spelling of 440243421 in words is "four hundred forty million, two hundred forty-three thousand, four hundred twenty-one".