198430857 has 32 divisors (see below), whose sum is σ = 305088000. Its totient is φ = 127370880.

The previous prime is 198430829. The next prime is 198430861. The reversal of 198430857 is 758034891.

198430857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 198430857 - 2¹¹ = 198428809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198430457) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 86319 + ... + 88587.

It is an arithmetic number, because the mean of its divisors is an integer number (9534000).

Almost surely, 2^198430857 is an apocalyptic number.

It is an amenable number.

198430857 is a deficient number, since it is larger than the sum of its proper divisors (106657143).

198430857 is a wasteful number, since it uses less digits than its factorization.

198430857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2398 (or 2392 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 198430857 is about 14086.5487966357. The cubic root of 198430857 is about 583.2701297146.

The spelling of 198430857 in words is "one hundred ninety-eight million, four hundred thirty thousand, eight hundred fifty-seven".