3989661 has 8 divisors (see below), whose sum is σ = 5728800. Its totient is φ = 2455152.

The previous prime is 3989653. The next prime is 3989663. The reversal of 3989661 is 1669893.

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

It is not a de Polignac number, because 3989661 - 2³ = 3989653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3989663) 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, 51111 + ... + 51188.

It is an arithmetic number, because the mean of its divisors is an integer number (716100).

Almost surely, 2^3989661 is an apocalyptic number.

It is an amenable number.

3989661 is a deficient number, since it is larger than the sum of its proper divisors (1739139).

3989661 is a wasteful number, since it uses less digits than its factorization.

3989661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102315.

The product of its digits is 69984, while the sum is 42.

The square root of 3989661 is about 1997.4135776048. The cubic root of 3989661 is about 158.6032193615.

The spelling of 3989661 in words is "three million, nine hundred eighty-nine thousand, six hundred sixty-one".