999198257 has 8 divisors (see below), whose sum is σ = 1007938752. Its totient is φ = 990486000.

The previous prime is 999198203. The next prime is 999198289. The reversal of 999198257 is 752891999.

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 999198257 - 2²⁸ = 730762801 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 999198196 and 999198205.

It is not an unprimeable number, because it can be changed into a prime (999198157) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67403 + ... + 80879.

It is an arithmetic number, because the mean of its divisors is an integer number (125992344).

Almost surely, 2^999198257 is an apocalyptic number.

It is an amenable number.

999198257 is a deficient number, since it is larger than the sum of its proper divisors (8740495).

999198257 is a wasteful number, since it uses less digits than its factorization.

999198257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14119.

The product of its digits is 3674160, while the sum is 59.

The square root of 999198257 is about 31610.0973899164. The cubic root of 999198257 is about 999.7326808802.

The spelling of 999198257 in words is "nine hundred ninety-nine million, one hundred ninety-eight thousand, two hundred fifty-seven".