39390587681 has 32 divisors (see below), whose sum is σ = 44652964608. Its totient is φ = 34542069760.

The previous prime is 39390587657. The next prime is 39390587771. The reversal of 39390587681 is 18678509393.

39390587681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 39390587681 - 2⁶ = 39390587617 is a prime.

It is a super-2 number, since 2×39390587681² (a number of 22 digits) contains 22 as substring.

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 39390587681.

It is not an unprimeable number, because it can be changed into a prime (39390587281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12775166 + ... + 12778248.

It is an arithmetic number, because the mean of its divisors is an integer number (1395405144).

Almost surely, 2^39390587681 is an apocalyptic number.

It is an amenable number.

39390587681 is a deficient number, since it is larger than the sum of its proper divisors (5262376927).

39390587681 is a wasteful number, since it uses less digits than its factorization.

39390587681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3961.

The product of its (nonzero) digits is 9797760, while the sum is 59.

The spelling of 39390587681 in words is "thirty-nine billion, three hundred ninety million, five hundred eighty-seven thousand, six hundred eighty-one".