198658423 has 2 divisors, whose sum is σ = 198658424. Its totient is φ = 198658422.

The previous prime is 198658373. The next prime is 198658451. The reversal of 198658423 is 324856891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 198658423 - 2²¹ = 196561271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198658483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99329211 + 99329212.

It is an arithmetic number, because the mean of its divisors is an integer number (99329212).

Almost surely, 2^198658423 is an apocalyptic number.

198658423 is a deficient number, since it is larger than the sum of its proper divisors (1).

198658423 is an equidigital number, since it uses as much as digits as its factorization.

198658423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 414720, while the sum is 46.

The square root of 198658423 is about 14094.6239041700. The cubic root of 198658423 is about 583.4930146432.

The spelling of 198658423 in words is "one hundred ninety-eight million, six hundred fifty-eight thousand, four hundred twenty-three".