440249839 has 2 divisors, whose sum is σ = 440249840. Its totient is φ = 440249838.

The previous prime is 440249827. The next prime is 440249863. The reversal of 440249839 is 938942044.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 440249839 - 2⁵ = 440249807 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 440249795 and 440249804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (440249819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220124919 + 220124920.

It is an arithmetic number, because the mean of its divisors is an integer number (220124920).

Almost surely, 2^440249839 is an apocalyptic number.

440249839 is a deficient number, since it is larger than the sum of its proper divisors (1).

440249839 is an equidigital number, since it uses as much as digits as its factorization.

440249839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248832, while the sum is 43.

The square root of 440249839 is about 20982.1314217598. The cubic root of 440249839 is about 760.7344233742.

The spelling of 440249839 in words is "four hundred forty million, two hundred forty-nine thousand, eight hundred thirty-nine".