198693640 has 32 divisors (see below), whose sum is σ = 470592000. Its totient is φ = 75294144.

The previous prime is 198693631. The next prime is 198693641. The reversal of 198693640 is 46396891.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (198693641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129960 + ... + 131479.

It is an arithmetic number, because the mean of its divisors is an integer number (14706000).

Almost surely, 2^198693640 is an apocalyptic number.

198693640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198693640 is an abundant number, since it is smaller than the sum of its proper divisors (271898360).

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

198693640 is a wasteful number, since it uses less digits than its factorization.

198693640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261469 (or 261465 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 198693640 is about 14095.8731549344. The cubic root of 198693640 is about 583.5274920124.

The spelling of 198693640 in words is "one hundred ninety-eight million, six hundred ninety-three thousand, six hundred forty".