440732989 has 2 divisors, whose sum is σ = 440732990. Its totient is φ = 440732988.

The previous prime is 440732977. The next prime is 440733017. The reversal of 440732989 is 989237044.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 432224100 + 8508889 = 20790^2 + 2917^2 .

It is a cyclic number.

It is not a de Polignac number, because 440732989 - 2⁷ = 440732861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (440730989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220366494 + 220366495.

It is an arithmetic number, because the mean of its divisors is an integer number (220366495).

Almost surely, 2^440732989 is an apocalyptic number.

It is an amenable number.

440732989 is a deficient number, since it is larger than the sum of its proper divisors (1).

440732989 is an equidigital number, since it uses as much as digits as its factorization.

440732989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 46.

The square root of 440732989 is about 20993.6416326468. The cubic root of 440732989 is about 761.0126097062.

The spelling of 440732989 in words is "four hundred forty million, seven hundred thirty-two thousand, nine hundred eighty-nine".