198618540 has 48 divisors (see below), whose sum is σ = 559235040. Its totient is φ = 52669440.

The previous prime is 198618527. The next prime is 198618557. The reversal of 198618540 is 45816891.

It is a junction number, because it is equal to n+sod(n) for n = 198618492 and 198618501.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1716 + ... + 20004.

It is an arithmetic number, because the mean of its divisors is an integer number (11650730).

Almost surely, 2^198618540 is an apocalyptic number.

198618540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198618540 is an abundant number, since it is smaller than the sum of its proper divisors (360616500).

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

198618540 is a wasteful number, since it uses less digits than its factorization.

198618540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18482 (or 18480 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 42.

The square root of 198618540 is about 14093.2090029205. The cubic root of 198618540 is about 583.4539643493.

The spelling of 198618540 in words is "one hundred ninety-eight million, six hundred eighteen thousand, five hundred forty".