198198747 has 36 divisors (see below), whose sum is σ = 308116224. Its totient is φ = 122709600.

The previous prime is 198198743. The next prime is 198198761. The reversal of 198198747 is 747891891.

It is not a de Polignac number, because 198198747 - 2² = 198198743 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 198198693 and 198198702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198198743) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 171622 + ... + 172772.

It is an arithmetic number, because the mean of its divisors is an integer number (8558784).

Almost surely, 2^198198747 is an apocalyptic number.

198198747 is a deficient number, since it is larger than the sum of its proper divisors (109917477).

198198747 is a wasteful number, since it uses less digits than its factorization.

198198747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1248 (or 1226 counting only the distinct ones).

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

The square root of 198198747 is about 14078.3076752854. The cubic root of 198198747 is about 583.0426186423.

The spelling of 198198747 in words is "one hundred ninety-eight million, one hundred ninety-eight thousand, seven hundred forty-seven".