198378923 has 2 divisors, whose sum is σ = 198378924. Its totient is φ = 198378922.

The previous prime is 198378913. The next prime is 198378959. The reversal of 198378923 is 329873891.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (329873891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198378923 - 2⁴ = 198378907 is a prime.

It is not a weakly prime, because it can be changed into another prime (198378913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99189461 + 99189462.

It is an arithmetic number, because the mean of its divisors is an integer number (99189462).

Almost surely, 2^198378923 is an apocalyptic number.

198378923 is a deficient number, since it is larger than the sum of its proper divisors (1).

198378923 is an equidigital number, since it uses as much as digits as its factorization.

198378923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 50.

The square root of 198378923 is about 14084.7052862316. The cubic root of 198378923 is about 583.2192401261.

The spelling of 198378923 in words is "one hundred ninety-eight million, three hundred seventy-eight thousand, nine hundred twenty-three".