3947166321 has 32 divisors (see below), whose sum is σ = 6322157568. Its totient is φ = 2141673600.

The previous prime is 3947166319. The next prime is 3947166341. The reversal of 3947166321 is 1236617493.

It is not a de Polignac number, because 3947166321 - 2¹ = 3947166319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3947166341) 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, 36346 + ... + 95996.

It is an arithmetic number, because the mean of its divisors is an integer number (197567424).

Almost surely, 2^3947166321 is an apocalyptic number.

It is an amenable number.

3947166321 is a deficient number, since it is larger than the sum of its proper divisors (2374991247).

3947166321 is a wasteful number, since it uses less digits than its factorization.

3947166321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59821.

The product of its digits is 163296, while the sum is 42.

The square root of 3947166321 is about 62826.4778656261. The cubic root of 3947166321 is about 1580.3810330559.

The spelling of 3947166321 in words is "three billion, nine hundred forty-seven million, one hundred sixty-six thousand, three hundred twenty-one".