3964387647 has 16 divisors (see below), whose sum is σ = 5767512192. Its totient is φ = 2402188320.

The previous prime is 3964387627. The next prime is 3964387657. The reversal of 3964387647 is 7467834693.

It is a happy number.

It is not a de Polignac number, because 3964387647 - 2¹¹ = 3964385599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3964387627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 238708 + ... + 254774.

It is an arithmetic number, because the mean of its divisors is an integer number (360469512).

Almost surely, 2^3964387647 is an apocalyptic number.

3964387647 is a deficient number, since it is larger than the sum of its proper divisors (1803124545).

3964387647 is a wasteful number, since it uses less digits than its factorization.

3964387647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23558.

The product of its digits is 18289152, while the sum is 57.

The square root of 3964387647 is about 62963.3833827249. The cubic root of 3964387647 is about 1582.6760779299.

The spelling of 3964387647 in words is "three billion, nine hundred sixty-four million, three hundred eighty-seven thousand, six hundred forty-seven".