3866985471840 has 48 divisors (see below), whose sum is σ = 12181004237808. Its totient is φ = 1031196125696.

The previous prime is 3866985471763. The next prime is 3866985471847. The reversal of 3866985471840 is 481745896683.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3866985471847) 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, 4028109387 + ... + 4028110346.

It is an arithmetic number, because the mean of its divisors is an integer number (253770921621).

Almost surely, 2^{3866985471840} is an apocalyptic number.

3866985471840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3866985471840 is an abundant number, since it is smaller than the sum of its proper divisors (8314018765968).

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

3866985471840 is a wasteful number, since it uses less digits than its factorization.

3866985471840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8056219751 (or 8056219743 counting only the distinct ones).

The product of its (nonzero) digits is 278691840, while the sum is 69.

The spelling of 3866985471840 in words is "three trillion, eight hundred sixty-six billion, nine hundred eighty-five million, four hundred seventy-one thousand, eight hundred forty".