39986880781 has 8 divisors (see below), whose sum is σ = 40296062144. Its totient is φ = 39678478560.

The previous prime is 39986880779. The next prime is 39986880793. The reversal of 39986880781 is 18708868993.

39986880781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 39986880781 - 2¹ = 39986880779 is a prime.

It is a super-2 number, since 2×39986880781² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39986880181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91536 + ... + 297241.

It is an arithmetic number, because the mean of its divisors is an integer number (5037007768).

Almost surely, 2^39986880781 is an apocalyptic number.

It is an amenable number.

39986880781 is a deficient number, since it is larger than the sum of its proper divisors (309181363).

39986880781 is a wasteful number, since it uses less digits than its factorization.

39986880781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389571.

The product of its (nonzero) digits is 41803776, while the sum is 67.

The spelling of 39986880781 in words is "thirty-nine billion, nine hundred eighty-six million, eight hundred eighty thousand, seven hundred eighty-one".