440669981 has 2 divisors, whose sum is σ = 440669982. Its totient is φ = 440669980.

The previous prime is 440669959. The next prime is 440670001. The reversal of 440669981 is 189966044.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 365153881 + 75516100 = 19109^2 + 8690^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-440669981 is a prime.

It is a super-3 number, since 3×440669981³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (440669081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220334990 + 220334991.

It is an arithmetic number, because the mean of its divisors is an integer number (220334991).

Almost surely, 2^440669981 is an apocalyptic number.

It is an amenable number.

440669981 is a deficient number, since it is larger than the sum of its proper divisors (1).

440669981 is an equidigital number, since it uses as much as digits as its factorization.

440669981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 440669981 is about 20992.1409341687. The cubic root of 440669981 is about 760.9763427230.

The spelling of 440669981 in words is "four hundred forty million, six hundred sixty-nine thousand, nine hundred eighty-one".