198428423 has 4 divisors (see below), whose sum is σ = 198459768. Its totient is φ = 198397080.

The previous prime is 198428413. The next prime is 198428441. The reversal of 198428423 is 324824891.

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 198428423 - 2¹⁸ = 198166279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198428413) 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, 2468 + ... + 20073.

It is an arithmetic number, because the mean of its divisors is an integer number (49614942).

Almost surely, 2^198428423 is an apocalyptic number.

198428423 is a deficient number, since it is larger than the sum of its proper divisors (31345).

198428423 is an equidigital number, since it uses as much as digits as its factorization.

198428423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31344.

The product of its digits is 110592, while the sum is 41.

The square root of 198428423 is about 14086.4624018949. The cubic root of 198428423 is about 583.2677448615.

The spelling of 198428423 in words is "one hundred ninety-eight million, four hundred twenty-eight thousand, four hundred twenty-three".