398668 has 6 divisors (see below), whose sum is σ = 697676. Its totient is φ = 199332.

The previous prime is 398627. The next prime is 398669. The reversal of 398668 is 866893.

It is a self number, because there is not a number n which added to its sum of digits gives 398668.

It is not an unprimeable number, because it can be changed into a prime (398669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49830 + ... + 49837.

2³⁹⁸⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

398668 is a deficient number, since it is larger than the sum of its proper divisors (299008).

398668 is a wasteful number, since it uses less digits than its factorization.

398668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99671 (or 99669 counting only the distinct ones).

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

The square root of 398668 is about 631.4016154556. The cubic root of 398668 is about 73.5987535233.

The spelling of 398668 in words is "three hundred ninety-eight thousand, six hundred sixty-eight".