198815457 has 8 divisors (see below), whose sum is σ = 266119776. Its totient is φ = 132027392.

The previous prime is 198815447. The next prime is 198815483. The reversal of 198815457 is 754518891.

It is a happy number.

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 198815457 - 2¹¹ = 198813409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198815417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128163 + ... + 129704.

It is an arithmetic number, because the mean of its divisors is an integer number (33264972).

Almost surely, 2^198815457 is an apocalyptic number.

It is an amenable number.

198815457 is a deficient number, since it is larger than the sum of its proper divisors (67304319).

198815457 is a wasteful number, since it uses less digits than its factorization.

198815457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258127.

The product of its digits is 403200, while the sum is 48.

The square root of 198815457 is about 14100.1935093104. The cubic root of 198815457 is about 583.6467191914.

The spelling of 198815457 in words is "one hundred ninety-eight million, eight hundred fifteen thousand, four hundred fifty-seven".