998603623 has 2 divisors, whose sum is σ = 998603624. Its totient is φ = 998603622.

The previous prime is 998603561. The next prime is 998603629. The reversal of 998603623 is 326306899.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 998603623 - 2¹³ = 998595431 is a prime.

It is a super-2 number, since 2×998603623² = 1994418391737452258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998603629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499301811 + 499301812.

It is an arithmetic number, because the mean of its divisors is an integer number (499301812).

Almost surely, 2^998603623 is an apocalyptic number.

998603623 is a deficient number, since it is larger than the sum of its proper divisors (1).

998603623 is an equidigital number, since it uses as much as digits as its factorization.

998603623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 419904, while the sum is 46.

The square root of 998603623 is about 31600.6902298035. The cubic root of 998603623 is about 999.5343241797.

The spelling of 998603623 in words is "nine hundred ninety-eight million, six hundred three thousand, six hundred twenty-three".