3971196840 has 128 divisors (see below), whose sum is σ = 13505385600. Its totient is φ = 926069760.

The previous prime is 3971196833. The next prime is 3971196841. The reversal of 3971196840 is 486911793.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 3971196840.

It is not an unprimeable number, because it can be changed into a prime (3971196841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37351 + ... + 96630.

It is an arithmetic number, because the mean of its divisors is an integer number (105510825).

Almost surely, 2^3971196840 is an apocalyptic number.

3971196840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3971196840 is an abundant number, since it is smaller than the sum of its proper divisors (9534188760).

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

3971196840 is a wasteful number, since it uses less digits than its factorization.

3971196840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134027 (or 134023 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 3971196840 is about 63017.4328261633. The cubic root of 3971196840 is about 1583.5816892289.

The spelling of 3971196840 in words is "three billion, nine hundred seventy-one million, one hundred ninety-six thousand, eight hundred forty".