198874917 has 6 divisors (see below), whose sum is σ = 287263782. Its totient is φ = 132583272.

The previous prime is 198874913. The next prime is 198874937. The reversal of 198874917 is 719478891.

It can be written as a sum of positive squares in only one way, i.e., 152621316 + 46253601 = 12354^2 + 6801^2 .

It is not a de Polignac number, because 198874917 - 2² = 198874913 is a prime.

It is a super-2 number, since 2×198874917² = 79102465223513778, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198874913) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11048598 + ... + 11048615.

It is an arithmetic number, because the mean of its divisors is an integer number (47877297).

Almost surely, 2^198874917 is an apocalyptic number.

It is an amenable number.

198874917 is a deficient number, since it is larger than the sum of its proper divisors (88388865).

198874917 is a wasteful number, since it uses less digits than its factorization.

198874917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22097219 (or 22097216 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 54.

The square root of 198874917 is about 14102.3018333888. The cubic root of 198874917 is about 583.7048973891.

The spelling of 198874917 in words is "one hundred ninety-eight million, eight hundred seventy-four thousand, nine hundred seventeen".