398641 has 4 divisors (see below), whose sum is σ = 400384. Its totient is φ = 396900.

The previous prime is 398627. The next prime is 398669. The reversal of 398641 is 146893.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 398641 - 2⁵ = 398609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 465 + ... + 1006.

It is an arithmetic number, because the mean of its divisors is an integer number (100096).

2³⁹⁸⁶⁴¹ is an apocalyptic number.

It is an amenable number.

398641 is a deficient number, since it is larger than the sum of its proper divisors (1743).

398641 is a wasteful number, since it uses less digits than its factorization.

398641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1742.

The product of its digits is 5184, while the sum is 31.

The square root of 398641 is about 631.3802340904. The cubic root of 398641 is about 73.5970919810.

The spelling of 398641 in words is "three hundred ninety-eight thousand, six hundred forty-one".