198457 has 4 divisors (see below), whose sum is σ = 226816. Its totient is φ = 170100.

The previous prime is 198439. The next prime is 198461. The reversal of 198457 is 754891.

It is a happy number.

198457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 de Polignac number, because none of the positive numbers 2^k-198457 is a prime.

It is a Duffinian number.

198457 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198427) 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, 14169 + ... + 14182.

It is an arithmetic number, because the mean of its divisors is an integer number (56704).

2¹⁹⁸⁴⁵⁷ is an apocalyptic number.

It is an amenable number.

198457 is a deficient number, since it is larger than the sum of its proper divisors (28359).

198457 is an equidigital number, since it uses as much as digits as its factorization.

198457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28358.

The product of its digits is 10080, while the sum is 34.

The square root of 198457 is about 445.4851288203. The cubic root of 198457 is about 58.3295743610.

The spelling of 198457 in words is "one hundred ninety-eight thousand, four hundred fifty-seven".