440040989 has 2 divisors, whose sum is σ = 440040990. Its totient is φ = 440040988.

The previous prime is 440040967. The next prime is 440041051. The reversal of 440040989 is 989040044.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 438902500 + 1138489 = 20950^2 + 1067^2 .

It is a cyclic number.

It is not a de Polignac number, because 440040989 - 2²⁰ = 438992413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (440040919) 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 as a sum of consecutive naturals, namely, 220020494 + 220020495.

It is an arithmetic number, because the mean of its divisors is an integer number (220020495).

Almost surely, 2^440040989 is an apocalyptic number.

It is an amenable number.

440040989 is a deficient number, since it is larger than the sum of its proper divisors (1).

440040989 is an equidigital number, since it uses as much as digits as its factorization.

440040989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 440040989 is about 20977.1539776014. The cubic root of 440040989 is about 760.6141094823.

The spelling of 440040989 in words is "four hundred forty million, forty thousand, nine hundred eighty-nine".