440242321 has 2 divisors, whose sum is σ = 440242322. Its totient is φ = 440242320.

The previous prime is 440242303. The next prime is 440242337. The reversal of 440242321 is 123242044.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 403809025 + 36433296 = 20095^2 + 6036^2 .

It is a cyclic number.

It is not a de Polignac number, because 440242321 - 2⁵ = 440242289 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 440242292 and 440242301.

It is not a weakly prime, because it can be changed into another prime (440242921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220121160 + 220121161.

It is an arithmetic number, because the mean of its divisors is an integer number (220121161).

Almost surely, 2^440242321 is an apocalyptic number.

It is an amenable number.

440242321 is a deficient number, since it is larger than the sum of its proper divisors (1).

440242321 is an equidigital number, since it uses as much as digits as its factorization.

440242321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 440242321 is about 20981.9522685569. The cubic root of 440242321 is about 760.7300930800.

Adding to 440242321 its reverse (123242044), we get a palindrome (563484365).

The spelling of 440242321 in words is "four hundred forty million, two hundred forty-two thousand, three hundred twenty-one".