198921393 has 32 divisors (see below), whose sum is σ = 338419200. Its totient is φ = 114210000.

The previous prime is 198921383. The next prime is 198921409. The reversal of 198921393 is 393129891.

It is a happy number.

It is not a de Polignac number, because 198921393 - 2⁴ = 198921377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198921313) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11983 + ... + 23268.

It is an arithmetic number, because the mean of its divisors is an integer number (10575600).

Almost surely, 2^198921393 is an apocalyptic number.

It is an amenable number.

198921393 is a deficient number, since it is larger than the sum of its proper divisors (139497807).

198921393 is a wasteful number, since it uses less digits than its factorization.

198921393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35290 (or 35284 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 198921393 is about 14103.9495532280. The cubic root of 198921393 is about 583.7503634141.

The spelling of 198921393 in words is "one hundred ninety-eight million, nine hundred twenty-one thousand, three hundred ninety-three".