198074721 has 8 divisors (see below), whose sum is σ = 284415040. Its totient is φ = 121892112.

The previous prime is 198074719. The next prime is 198074729. The reversal of 198074721 is 127470891.

198074721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 198074721 - 2¹ = 198074719 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 5078839 = 198074721 / (1 + 9 + 8 + 0 + 7 + 4 + 7 + 2 + 1).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 198074721.

It is not an unprimeable number, because it can be changed into a prime (198074729) 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, 2539381 + ... + 2539458.

It is an arithmetic number, because the mean of its divisors is an integer number (35551880).

Almost surely, 2^198074721 is an apocalyptic number.

It is an amenable number.

198074721 is a deficient number, since it is larger than the sum of its proper divisors (86340319).

198074721 is a wasteful number, since it uses less digits than its factorization.

198074721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5078855.

The product of its (nonzero) digits is 28224, while the sum is 39.

The square root of 198074721 is about 14073.9021241445. The cubic root of 198074721 is about 582.9209772197.

The spelling of 198074721 in words is "one hundred ninety-eight million, seventy-four thousand, seven hundred twenty-one".