198431 has 8 divisors (see below), whose sum is σ = 211584. Its totient is φ = 185760.

The previous prime is 198427. The next prime is 198437. The reversal of 198431 is 134891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 198431 - 2² = 198427 is a prime.

It is a super-2 number, since 2×198431² = 78749723522, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 198431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1061 + ... + 1233.

It is an arithmetic number, because the mean of its divisors is an integer number (26448).

2¹⁹⁸⁴³¹ is an apocalyptic number.

198431 is a deficient number, since it is larger than the sum of its proper divisors (13153).

198431 is a wasteful number, since it uses less digits than its factorization.

198431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241.

The product of its digits is 864, while the sum is 26.

The square root of 198431 is about 445.4559461945. The cubic root of 198431 is about 58.3270269827.

It can be divided in two parts, 1984 and 31, that multiplied together give a square (61504 = 248²).

The spelling of 198431 in words is "one hundred ninety-eight thousand, four hundred thirty-one".