3988561 has 8 divisors (see below), whose sum is σ = 4114944. Its totient is φ = 3864000.

The previous prime is 3988541. The next prime is 3988583. The reversal of 3988561 is 1658893.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3988561 - 2⁷ = 3988433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3988531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4936 + ... + 5686.

It is an arithmetic number, because the mean of its divisors is an integer number (514368).

Almost surely, 2^3988561 is an apocalyptic number.

It is an amenable number.

3988561 is a deficient number, since it is larger than the sum of its proper divisors (126383).

3988561 is a wasteful number, since it uses less digits than its factorization.

3988561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911.

The product of its digits is 51840, while the sum is 40.

The square root of 3988561 is about 1997.1382025288. The cubic root of 3988561 is about 158.5886417171.

The spelling of 3988561 in words is "three million, nine hundred eighty-eight thousand, five hundred sixty-one".