198149423 has 4 divisors (see below), whose sum is σ = 208578360. Its totient is φ = 187720488.

The previous prime is 198149417. The next prime is 198149429. The reversal of 198149423 is 324941891.

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

It is an interprime number because it is at equal distance from previous prime (198149417) and next prime (198149429).

It is a cyclic number.

It is not a de Polignac number, because 198149423 - 2⁶ = 198149359 is a prime.

It is a super-3 number, since 3×198149423³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198149429) 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, 5214440 + ... + 5214477.

It is an arithmetic number, because the mean of its divisors is an integer number (52144590).

Almost surely, 2^198149423 is an apocalyptic number.

198149423 is a deficient number, since it is larger than the sum of its proper divisors (10428937).

198149423 is a wasteful number, since it uses less digits than its factorization.

198149423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10428936.

The product of its digits is 62208, while the sum is 41.

The square root of 198149423 is about 14076.5557932329. Note that the first 3 decimals coincide. The cubic root of 198149423 is about 582.9942490462.

The spelling of 198149423 in words is "one hundred ninety-eight million, one hundred forty-nine thousand, four hundred twenty-three".