198645539 has 4 divisors (see below), whose sum is σ = 199685760. Its totient is φ = 197605320.

The previous prime is 198645523. The next prime is 198645571. The reversal of 198645539 is 935546891.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 198645539 - 2⁴ = 198645523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198645599) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 519824 + ... + 520205.

It is an arithmetic number, because the mean of its divisors is an integer number (49921440).

Almost surely, 2^198645539 is an apocalyptic number.

198645539 is a deficient number, since it is larger than the sum of its proper divisors (1040221).

198645539 is a wasteful number, since it uses less digits than its factorization.

198645539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040220.

The product of its digits is 1166400, while the sum is 50.

The square root of 198645539 is about 14094.1668430596. The cubic root of 198645539 is about 583.4804002162.

The spelling of 198645539 in words is "one hundred ninety-eight million, six hundred forty-five thousand, five hundred thirty-nine".