440388997 has 2 divisors, whose sum is σ = 440388998. Its totient is φ = 440388996.

The previous prime is 440388989. The next prime is 440389003. The reversal of 440388997 is 799883044.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 405176641 + 35212356 = 20129^2 + 5934^2 .

It is a cyclic number.

It is not a de Polignac number, because 440388997 - 2³ = 440388989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (440388917) 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, 220194498 + 220194499.

It is an arithmetic number, because the mean of its divisors is an integer number (220194499).

Almost surely, 2^440388997 is an apocalyptic number.

It is an amenable number.

440388997 is a deficient number, since it is larger than the sum of its proper divisors (1).

440388997 is an equidigital number, since it uses as much as digits as its factorization.

440388997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The square root of 440388997 is about 20985.4472670944. The cubic root of 440388997 is about 760.8145681159.

It can be divided in two parts, 44038 and 8997, that added together give a palindrome (53035).

The spelling of 440388997 in words is "four hundred forty million, three hundred eighty-eight thousand, nine hundred ninety-seven".