198915643 has 8 divisors (see below), whose sum is σ = 201432528. Its totient is φ = 196414464.

The previous prime is 198915631. The next prime is 198915667. The reversal of 198915643 is 346519891.

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 198915643 - 2⁹ = 198915131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 198915593 and 198915602.

It is not an unprimeable number, because it can be changed into a prime (198915043) 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, 22680 + ... + 30202.

It is an arithmetic number, because the mean of its divisors is an integer number (25179066).

Almost surely, 2^198915643 is an apocalyptic number.

198915643 is a deficient number, since it is larger than the sum of its proper divisors (2516885).

198915643 is a wasteful number, since it uses less digits than its factorization.

198915643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7853.

The product of its digits is 233280, while the sum is 46.

The square root of 198915643 is about 14103.7457081443. The cubic root of 198915643 is about 583.7447387519.

The spelling of 198915643 in words is "one hundred ninety-eight million, nine hundred fifteen thousand, six hundred forty-three".