3891399872 has 28 divisors (see below), whose sum is σ = 7910343336. Its totient is φ = 1898242560.

The previous prime is 3891399857. The next prime is 3891399881. The reversal of 3891399872 is 2789931983.

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, 738878 + ... + 744125.

It is an arithmetic number, because the mean of its divisors is an integer number (282512262).

Almost surely, 2^3891399872 is an apocalyptic number.

3891399872 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

3891399872 is an abundant number, since it is smaller than the sum of its proper divisors (4018943464).

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

3891399872 is a wasteful number, since it uses less digits than its factorization.

3891399872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1483056 (or 1483046 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 59.

The square root of 3891399872 is about 62381.0858514021. The cubic root of 3891399872 is about 1572.9030458550.

The spelling of 3891399872 in words is "three billion, eight hundred ninety-one million, three hundred ninety-nine thousand, eight hundred seventy-two".