398866 has 24 divisors (see below), whose sum is σ = 696780. Its totient is φ = 170016.

The previous prime is 398863. The next prime is 398887. The reversal of 398866 is 668893.

398866 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 385641 + 13225 = 621^2 + 115^2 .

It is not an unprimeable number, because it can be changed into a prime (398863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13740 + ... + 13768.

2³⁹⁸⁸⁶⁶ is an apocalyptic number.

398866 is a deficient number, since it is larger than the sum of its proper divisors (297914).

398866 is a wasteful number, since it uses less digits than its factorization.

398866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90 (or 67 counting only the distinct ones).

The product of its digits is 62208, while the sum is 40.

The square root of 398866 is about 631.5583900163. The cubic root of 398866 is about 73.6109358750.

The spelling of 398866 in words is "three hundred ninety-eight thousand, eight hundred sixty-six".