3985076643 has 16 divisors (see below), whose sum is σ = 5511496320. Its totient is φ = 2559380544.

The previous prime is 3985076639. The next prime is 3985076659. The reversal of 3985076643 is 3466705893.

It is not a de Polignac number, because 3985076643 - 2² = 3985076639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3985076603) 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, 202173 + ... + 221006.

It is an arithmetic number, because the mean of its divisors is an integer number (344468520).

Almost surely, 2^3985076643 is an apocalyptic number.

3985076643 is a deficient number, since it is larger than the sum of its proper divisors (1526419677).

3985076643 is a wasteful number, since it uses less digits than its factorization.

3985076643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423298.

The product of its (nonzero) digits is 3265920, while the sum is 51.

The square root of 3985076643 is about 63127.4634608425. The cubic root of 3985076643 is about 1585.4244791179.

The spelling of 3985076643 in words is "three billion, nine hundred eighty-five million, seventy-six thousand, six hundred forty-three".