440989 has 2 divisors, whose sum is σ = 440990. Its totient is φ = 440988.

The previous prime is 440987. The next prime is 441011. The reversal of 440989 is 989044.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 416025 + 24964 = 645^2 + 158^2 .

It is a cyclic number.

It is not a de Polignac number, because 440989 - 2¹ = 440987 is a prime.

Together with 440987, it forms a pair of twin primes.

440989 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (440983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220494 + 220495.

It is an arithmetic number, because the mean of its divisors is an integer number (220495).

2⁴⁴⁰⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

440989 is a deficient number, since it is larger than the sum of its proper divisors (1).

440989 is an equidigital number, since it uses as much as digits as its factorization.

440989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 440989 is about 664.0700264279. The cubic root of 440989 is about 76.1159932381.

The spelling of 440989 in words is "four hundred forty thousand, nine hundred eighty-nine".