198445257 has 12 divisors (see below), whose sum is σ = 288543424. Its totient is φ = 131419800.

The previous prime is 198445249. The next prime is 198445271. The reversal of 198445257 is 752544891.

198445257 is a `hidden beast` number, since 198 + 4 + 452 + 5 + 7 = 666.

It is not a de Polignac number, because 198445257 - 2³ = 198445249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198445957) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71653 + ... + 74370.

Almost surely, 2^198445257 is an apocalyptic number.

It is an amenable number.

198445257 is a deficient number, since it is larger than the sum of its proper divisors (90098167).

198445257 is a wasteful number, since it uses less digits than its factorization.

198445257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146180 (or 146177 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The square root of 198445257 is about 14087.0599132679. The cubic root of 198445257 is about 583.2842385530.

The spelling of 198445257 in words is "one hundred ninety-eight million, four hundred forty-five thousand, two hundred fifty-seven".