3899928456787 has 4 divisors (see below), whose sum is σ = 4254467407416. Its totient is φ = 3545389506160.

The previous prime is 3899928456773. The next prime is 3899928456799. The reversal of 3899928456787 is 7876548299983.

It is a happy number.

3899928456787 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3899928456787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3899928456707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177269475298 + ... + 177269475319.

It is an arithmetic number, because the mean of its divisors is an integer number (1063616851854).

Almost surely, 2^{3899928456787} is an apocalyptic number.

3899928456787 is a deficient number, since it is larger than the sum of its proper divisors (354538950629).

3899928456787 is a wasteful number, since it uses less digits than its factorization.

3899928456787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354538950628.

The product of its digits is 13168189440, while the sum is 85.

The spelling of 3899928456787 in words is "three trillion, eight hundred ninety-nine billion, nine hundred twenty-eight million, four hundred fifty-six thousand, seven hundred eighty-seven".