39643281089 has 16 divisors (see below), whose sum is σ = 41082224640. Its totient is φ = 38214666000.

The previous prime is 39643281049. The next prime is 39643281107. The reversal of 39643281089 is 98018234693.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 39643281089 - 2¹⁶ = 39643215553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 39643281089.

It is not an unprimeable number, because it can be changed into a prime (39643281049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9367604 + ... + 9371834.

It is an arithmetic number, because the mean of its divisors is an integer number (2567639040).

Almost surely, 2^39643281089 is an apocalyptic number.

It is an amenable number.

39643281089 is a deficient number, since it is larger than the sum of its proper divisors (1438943551).

39643281089 is a wasteful number, since it uses less digits than its factorization.

39643281089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5372.

The product of its (nonzero) digits is 2239488, while the sum is 53.

The spelling of 39643281089 in words is "thirty-nine billion, six hundred forty-three million, two hundred eighty-one thousand, eighty-nine".