198308540 has 12 divisors (see below), whose sum is σ = 416447976. Its totient is φ = 79323408.

The previous prime is 198308533. The next prime is 198308549. The reversal of 198308540 is 45803891.

It is a junction number, because it is equal to n+sod(n) for n = 198308494 and 198308503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198308549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4957694 + ... + 4957733.

It is an arithmetic number, because the mean of its divisors is an integer number (34703998).

Almost surely, 2^198308540 is an apocalyptic number.

198308540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198308540 is an abundant number, since it is smaller than the sum of its proper divisors (218139436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

198308540 is a wasteful number, since it uses less digits than its factorization.

198308540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9915436 (or 9915434 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 198308540 is about 14082.2065032437. The cubic root of 198308540 is about 583.1502583769.

The spelling of 198308540 in words is "one hundred ninety-eight million, three hundred eight thousand, five hundred forty".