3891111212 has 24 divisors (see below), whose sum is σ = 6910023120. Its totient is φ = 1917017280.

The previous prime is 3891111197. The next prime is 3891111223. The reversal of 3891111212 is 2121111983.

It is a happy 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, 54263 + ... + 103569.

It is an arithmetic number, because the mean of its divisors is an integer number (287917630).

Almost surely, 2^3891111212 is an apocalyptic number.

It is an amenable number.

3891111212 is a deficient number, since it is larger than the sum of its proper divisors (3018911908).

3891111212 is a wasteful number, since it uses less digits than its factorization.

3891111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49601 (or 49599 counting only the distinct ones).

The product of its digits is 864, while the sum is 29.

The square root of 3891111212 is about 62378.7721264213. The cubic root of 3891111212 is about 1572.8641527886.

The spelling of 3891111212 in words is "three billion, eight hundred ninety-one million, one hundred eleven thousand, two hundred twelve".