3911989816 has 32 divisors (see below), whose sum is σ = 8875945440. Its totient is φ = 1577945088.

The previous prime is 3911989813. The next prime is 3911989817. The reversal of 3911989816 is 6189891193.

It is a super-3 number, since 3×3911989816³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3911989813) 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, 2053665 + ... + 2055568.

It is an arithmetic number, because the mean of its divisors is an integer number (277373295).

Almost surely, 2^3911989816 is an apocalyptic number.

It is an amenable number.

3911989816 is an abundant number, since it is smaller than the sum of its proper divisors (4963955624).

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

3911989816 is a wasteful number, since it uses less digits than its factorization.

3911989816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4109263 (or 4109259 counting only the distinct ones).

The product of its digits is 839808, while the sum is 55.

The square root of 3911989816 is about 62545.9016722918. The cubic root of 3911989816 is about 1575.6723177886.

The spelling of 3911989816 in words is "three billion, nine hundred eleven million, nine hundred eighty-nine thousand, eight hundred sixteen".