398001 has 4 divisors (see below), whose sum is σ = 530672. Its totient is φ = 265332.

The previous prime is 397981. The next prime is 398011. The reversal of 398001 is 100893.

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 not a de Polignac number, because 398001 - 2⁹ = 397489 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398011) 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, 66331 + ... + 66336.

It is an arithmetic number, because the mean of its divisors is an integer number (132668).

2³⁹⁸⁰⁰¹ is an apocalyptic number.

It is an amenable number.

398001 is a deficient number, since it is larger than the sum of its proper divisors (132671).

398001 is a wasteful number, since it uses less digits than its factorization.

398001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132670.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 398001 is about 630.8732043763. The cubic root of 398001 is about 73.5576852900.

Adding to 398001 its reverse (100893), we get a palindrome (498894).

The spelling of 398001 in words is "three hundred ninety-eight thousand, one".