3947493976 has 32 divisors (see below), whose sum is σ = 7965427680. Its totient is φ = 1827187200.

The previous prime is 3947493973. The next prime is 3947493989. The reversal of 3947493976 is 6793947493.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3947493971) 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, 229620 + ... + 246211.

It is an arithmetic number, because the mean of its divisors is an integer number (248919615).

Almost surely, 2^3947493976 is an apocalyptic number.

It is an amenable number.

3947493976 is an abundant number, since it is smaller than the sum of its proper divisors (4017933704).

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

3947493976 is a wasteful number, since it uses less digits than its factorization.

3947493976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475915 (or 475911 counting only the distinct ones).

The product of its digits is 30862944, while the sum is 61.

The square root of 3947493976 is about 62829.0854302368. The cubic root of 3947493976 is about 1580.4247610857.

The spelling of 3947493976 in words is "three billion, nine hundred forty-seven million, four hundred ninety-three thousand, nine hundred seventy-six".