198425839 has 4 divisors (see below), whose sum is σ = 198684640. Its totient is φ = 198167040.

The previous prime is 198425827. The next prime is 198425867. The reversal of 198425839 is 938524891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 938524891 = 41 ⋅22890851.

It is a cyclic number.

It is not a de Polignac number, because 198425839 - 2²³ = 190037231 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 198425792 and 198425801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198425239) 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, 128247 + ... + 129784.

It is an arithmetic number, because the mean of its divisors is an integer number (49671160).

Almost surely, 2^198425839 is an apocalyptic number.

198425839 is a deficient number, since it is larger than the sum of its proper divisors (258801).

198425839 is an equidigital number, since it uses as much as digits as its factorization.

198425839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258800.

The product of its digits is 622080, while the sum is 49.

The square root of 198425839 is about 14086.3706823298. The cubic root of 198425839 is about 583.2652130159.

The spelling of 198425839 in words is "one hundred ninety-eight million, four hundred twenty-five thousand, eight hundred thirty-nine".