398197 has 4 divisors (see below), whose sum is σ = 400140. Its totient is φ = 396256.

The previous prime is 398171. The next prime is 398207. The reversal of 398197 is 791893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 791893 = 263 ⋅3011.

It can be written as a sum of positive squares in 2 ways, for example, as 77841 + 320356 = 279^2 + 566^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398117) 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, 622 + ... + 1087.

It is an arithmetic number, because the mean of its divisors is an integer number (100035).

2³⁹⁸¹⁹⁷ is an apocalyptic number.

It is an amenable number.

398197 is a deficient number, since it is larger than the sum of its proper divisors (1943).

398197 is a wasteful number, since it uses less digits than its factorization.

398197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1942.

The product of its digits is 13608, while the sum is 37.

The square root of 398197 is about 631.0285255042. The cubic root of 398197 is about 73.5697580740.

It can be divided in two parts, 398 and 197, that added together give a palindrome (595).

The spelling of 398197 in words is "three hundred ninety-eight thousand, one hundred ninety-seven".