398646 has 12 divisors (see below), whose sum is σ = 863772. Its totient is φ = 132876.

The previous prime is 398627. The next prime is 398669. The reversal of 398646 is 646893.

398646 is a `hidden beast` number, since 3 + 9 + 8 + 646 = 666.

It is a d-powerful number, because it can be written as 3¹⁰ + 9⁵ + 6² + 8³ + 4³ + 6⁷ .

It is a self number, because there is not a number n which added to its sum of digits gives 398646.

It is a congruent number.

It is an unprimeable number.

398646 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11056 + ... + 11091.

It is an arithmetic number, because the mean of its divisors is an integer number (71981).

2³⁹⁸⁶⁴⁶ is an apocalyptic number.

398646 is an abundant number, since it is smaller than the sum of its proper divisors (465126).

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

398646 is a wasteful number, since it uses less digits than its factorization.

398646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22155 (or 22152 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 398646 is about 631.3841936571. The cubic root of 398646 is about 73.5973996797.

The spelling of 398646 in words is "three hundred ninety-eight thousand, six hundred forty-six".