3989637561 has 48 divisors (see below), whose sum is σ = 6781034624. Its totient is φ = 2031740928.

The previous prime is 3989637541. The next prime is 3989637577. The reversal of 3989637561 is 1657369893.

It is a happy number.

It is not a de Polignac number, because 3989637561 - 2⁵ = 3989637529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3989637541) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 220905 + ... + 238281.

Almost surely, 2^3989637561 is an apocalyptic number.

It is an amenable number.

3989637561 is a deficient number, since it is larger than the sum of its proper divisors (2791397063).

3989637561 is a wasteful number, since it uses less digits than its factorization.

3989637561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17458 (or 17429 counting only the distinct ones).

The product of its digits is 7348320, while the sum is 57.

The square root of 3989637561 is about 63163.5778039845. The cubic root of 3989637561 is about 1586.0290876631.

The spelling of 3989637561 in words is "three billion, nine hundred eighty-nine million, six hundred thirty-seven thousand, five hundred sixty-one".