40443999989 has 2 divisors, whose sum is σ = 40443999990. Its totient is φ = 40443999988.

The previous prime is 40443999983. The next prime is 40444000007. The reversal of 40443999989 is 98999934404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27368077489 + 13075922500 = 165433^2 + 114350^2 .

It is a cyclic number.

It is not a de Polignac number, because 40443999989 - 2³² = 36149032693 is a prime.

It is a super-2 number, since 2×40443999989² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40443999983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20221999994 + 20221999995.

It is an arithmetic number, because the mean of its divisors is an integer number (20221999995).

Almost surely, 2^40443999989 is an apocalyptic number.

It is an amenable number.

40443999989 is a deficient number, since it is larger than the sum of its proper divisors (1).

40443999989 is an equidigital number, since it uses as much as digits as its factorization.

40443999989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90699264, while the sum is 68.

The spelling of 40443999989 in words is "forty billion, four hundred forty-three million, nine hundred ninety-nine thousand, nine hundred eighty-nine".