3986658 has 48 divisors (see below), whose sum is σ = 9662016. Its totient is φ = 1224720.

The previous prime is 3986651. The next prime is 3986663. The reversal of 3986658 is 8566893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3986651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6003 + ... + 6633.

It is an arithmetic number, because the mean of its divisors is an integer number (201292).

Almost surely, 2^3986658 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3986658, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4831008).

3986658 is an abundant number, since it is smaller than the sum of its proper divisors (5675358).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3986658 is a wasteful number, since it uses less digits than its factorization.

3986658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661 (or 649 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 3986658 is about 1996.6617139616. The cubic root of 3986658 is about 158.5634160618.

It can be divided in two parts, 398 and 6658, that added together give a square (7056 = 84²).

The spelling of 3986658 in words is "three million, nine hundred eighty-six thousand, six hundred fifty-eight".