198423680 has 128 divisors (see below), whose sum is σ = 583994880. Its totient is φ = 62779392.

The previous prime is 198423671. The next prime is 198423683. The reversal of 198423680 is 86324891.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (198423683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56537 + ... + 59943.

It is an arithmetic number, because the mean of its divisors is an integer number (4562460).

Almost surely, 2^198423680 is an apocalyptic number.

198423680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 198423680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (291997440).

198423680 is an abundant number, since it is smaller than the sum of its proper divisors (385571200).

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

198423680 is a wasteful number, since it uses less digits than its factorization.

198423680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3446 (or 3434 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 198423680 is about 14086.2940477615. The cubic root of 198423680 is about 583.2630975754.

The spelling of 198423680 in words is "one hundred ninety-eight million, four hundred twenty-three thousand, six hundred eighty".