257198 has 4 divisors (see below), whose sum is σ = 385800. Its totient is φ = 128598.

The previous prime is 257189. The next prime is 257219. The reversal of 257198 is 891752.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×257198² = 132301622408, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

257198 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64298 + ... + 64301.

It is an arithmetic number, because the mean of its divisors is an integer number (96450).

2²⁵⁷¹⁹⁸ is an apocalyptic number.

257198 is a deficient number, since it is larger than the sum of its proper divisors (128602).

257198 is a wasteful number, since it uses less digits than its factorization.

257198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128601.

The product of its digits is 5040, while the sum is 32.

The square root of 257198 is about 507.1469215129. The cubic root of 257198 is about 63.5949351873.

The spelling of 257198 in words is "two hundred fifty-seven thousand, one hundred ninety-eight".