3991887902 has 16 divisors (see below), whose sum is σ = 6039154800. Its totient is φ = 1978875840.

The previous prime is 3991887877. The next prime is 3991887919. The reversal of 3991887902 is 2097881993.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 202124 + ... + 220992.

It is an arithmetic number, because the mean of its divisors is an integer number (377447175).

Almost surely, 2^3991887902 is an apocalyptic number.

3991887902 is a deficient number, since it is larger than the sum of its proper divisors (2047266898).

3991887902 is a wasteful number, since it uses less digits than its factorization.

3991887902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19771.

The product of its (nonzero) digits is 1959552, while the sum is 56.

The square root of 3991887902 is about 63181.3888894507. The cubic root of 3991887902 is about 1586.3272296532.

The spelling of 3991887902 in words is "three billion, nine hundred ninety-one million, eight hundred eighty-seven thousand, nine hundred two".