198305123 has 4 divisors (see below), whose sum is σ = 198420768. Its totient is φ = 198189480.

The previous prime is 198305111. The next prime is 198305137. The reversal of 198305123 is 321503891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198305123 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 198305123.

It is not an unprimeable number, because it can be changed into a prime (198305183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55211 + ... + 58692.

It is an arithmetic number, because the mean of its divisors is an integer number (49605192).

Almost surely, 2^198305123 is an apocalyptic number.

198305123 is a deficient number, since it is larger than the sum of its proper divisors (115645).

198305123 is a wasteful number, since it uses less digits than its factorization.

198305123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115644.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 198305123 is about 14082.0851794044. The cubic root of 198305123 is about 583.1469089904.

The spelling of 198305123 in words is "one hundred ninety-eight million, three hundred five thousand, one hundred twenty-three".