198038923 has 4 divisors (see below), whose sum is σ = 199075968. Its totient is φ = 197001880.

The previous prime is 198038921. The next prime is 198038989. The reversal of 198038923 is 329830891.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 198038923 - 2¹ = 198038921 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 198038923.

It is not an unprimeable number, because it can be changed into a prime (198038921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 518236 + ... + 518617.

It is an arithmetic number, because the mean of its divisors is an integer number (49768992).

Almost surely, 2^198038923 is an apocalyptic number.

198038923 is a deficient number, since it is larger than the sum of its proper divisors (1037045).

198038923 is a wasteful number, since it uses less digits than its factorization.

198038923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037044.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 198038923 is about 14072.6302800862. The cubic root of 198038923 is about 582.8858580447.

The spelling of 198038923 in words is "one hundred ninety-eight million, thirty-eight thousand, nine hundred twenty-three".