3891228972 has 12 divisors (see below), whose sum is σ = 9079534296. Its totient is φ = 1297076320.

The previous prime is 3891228953. The next prime is 3891228973. The reversal of 3891228972 is 2798221983.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (3891228973) 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, 162134529 + ... + 162134552.

It is an arithmetic number, because the mean of its divisors is an integer number (756627858).

Almost surely, 2^3891228972 is an apocalyptic number.

It is an amenable number.

3891228972 is an abundant number, since it is smaller than the sum of its proper divisors (5188305324).

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

3891228972 is a wasteful number, since it uses less digits than its factorization.

3891228972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324269088 (or 324269086 counting only the distinct ones).

The product of its digits is 870912, while the sum is 51.

The square root of 3891228972 is about 62379.7160301327. The cubic root of 3891228972 is about 1572.8800196027.

The spelling of 3891228972 in words is "three billion, eight hundred ninety-one million, two hundred twenty-eight thousand, nine hundred seventy-two".