998659423 has 2 divisors, whose sum is σ = 998659424. Its totient is φ = 998659422.

The previous prime is 998659421. The next prime is 998659433. The reversal of 998659423 is 324956899.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 998659423 - 2¹ = 998659421 is a prime.

Together with 998659421, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998659421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499329711 + 499329712.

It is an arithmetic number, because the mean of its divisors is an integer number (499329712).

Almost surely, 2^998659423 is an apocalyptic number.

998659423 is a deficient number, since it is larger than the sum of its proper divisors (1).

998659423 is an equidigital number, since it uses as much as digits as its factorization.

998659423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4199040, while the sum is 55.

The square root of 998659423 is about 31601.5731095779. The cubic root of 998659423 is about 999.5529411682.

The spelling of 998659423 in words is "nine hundred ninety-eight million, six hundred fifty-nine thousand, four hundred twenty-three".