3971871870 has 32 divisors (see below), whose sum is σ = 9535923072. Its totient is φ = 1058784672.

The previous prime is 3971871851. The next prime is 3971871877. The reversal of 3971871870 is 781781793.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3971871877) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66549 + ... + 111231.

It is an arithmetic number, because the mean of its divisors is an integer number (297997596).

Almost surely, 2^3971871870 is an apocalyptic number.

3971871870 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

3971871870 is an abundant number, since it is smaller than the sum of its proper divisors (5564051202).

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

3971871870 is a wasteful number, since it uses less digits than its factorization.

3971871870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47656.

The product of its (nonzero) digits is 592704, while the sum is 51.

The square root of 3971871870 is about 63022.7884974951. The cubic root of 3971871870 is about 1583.6714106763.

The spelling of 3971871870 in words is "three billion, nine hundred seventy-one million, eight hundred seventy-one thousand, eight hundred seventy".