39998289856 has 28 divisors (see below), whose sum is σ = 90710408368. Its totient is φ = 17142124032.

The previous prime is 39998289847. The next prime is 39998289883. The reversal of 39998289856 is 65898289993.

It is a tau number, because it is divible by the number of its divisors (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44640501 + ... + 44641396.

Almost surely, 2^39998289856 is an apocalyptic number.

It is an amenable number.

39998289856 is an abundant number, since it is smaller than the sum of its proper divisors (50712118512).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39998289856 is an equidigital number, since it uses as much as digits as its factorization.

39998289856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89281916 (or 89281906 counting only the distinct ones).

The product of its digits is 604661760, while the sum is 76.

The spelling of 39998289856 in words is "thirty-nine billion, nine hundred ninety-eight million, two hundred eighty-nine thousand, eight hundred fifty-six".