3958866 has 12 divisors (see below), whose sum is σ = 8577582. Its totient is φ = 1319616.

The previous prime is 3958847. The next prime is 3958879. The reversal of 3958866 is 6688593.

3958866 is a `hidden beast` number, since 3 + 9 + 588 + 66 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3186225 + 772641 = 1785^2 + 879^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 109951 + ... + 109986.

Almost surely, 2^3958866 is an apocalyptic number.

3958866 is an abundant number, since it is smaller than the sum of its proper divisors (4618716).

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

3958866 is a wasteful number, since it uses less digits than its factorization.

3958866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219945 (or 219942 counting only the distinct ones).

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

The square root of 3958866 is about 1989.6899255914. The cubic root of 3958866 is about 158.1940946405.

It can be divided in two parts, 395 and 8866, that added together give a cube (9261 = 21³).

The spelling of 3958866 in words is "three million, nine hundred fifty-eight thousand, eight hundred sixty-six".