198540685 has 8 divisors (see below), whose sum is σ = 272284416. Its totient is φ = 136142160.

The previous prime is 198540679. The next prime is 198540707. The reversal of 198540685 is 586045891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 198540685 - 2³ = 198540677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2836261 + ... + 2836330.

It is an arithmetic number, because the mean of its divisors is an integer number (34035552).

Almost surely, 2^198540685 is an apocalyptic number.

It is an amenable number.

198540685 is a deficient number, since it is larger than the sum of its proper divisors (73743731).

198540685 is an equidigital number, since it uses as much as digits as its factorization.

198540685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5672603.

The product of its (nonzero) digits is 345600, while the sum is 46.

The square root of 198540685 is about 14090.4465862513. The cubic root of 198540685 is about 583.3777197971.

The spelling of 198540685 in words is "one hundred ninety-eight million, five hundred forty thousand, six hundred eighty-five".