3970639866 has 32 divisors (see below), whose sum is σ = 8206469568. Its totient is φ = 1279958400.

The previous prime is 3970639847. The next prime is 3970639889. The reversal of 3970639866 is 6689360793.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50131 + ... + 102246.

It is an arithmetic number, because the mean of its divisors is an integer number (256452174).

Almost surely, 2^3970639866 is an apocalyptic number.

3970639866 is an abundant number, since it is smaller than the sum of its proper divisors (4235829702).

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

3970639866 is a wasteful number, since it uses less digits than its factorization.

3970639866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152526.

The product of its (nonzero) digits is 8817984, while the sum is 57.

The square root of 3970639866 is about 63013.0134654739. The cubic root of 3970639866 is about 1583.5076515100.

The spelling of 3970639866 in words is "three billion, nine hundred seventy million, six hundred thirty-nine thousand, eight hundred sixty-six".