998629 has 2 divisors, whose sum is σ = 998630. Its totient is φ = 998628.

The previous prime is 998623. The next prime is 998633. The reversal of 998629 is 926899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 954529 + 44100 = 977^2 + 210^2 .

It is an emirp because it is prime and its reverse (926899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 998629 - 2⁹ = 998117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499314 + 499315.

It is an arithmetic number, because the mean of its divisors is an integer number (499315).

2⁹⁹⁸⁶²⁹ is an apocalyptic number.

It is an amenable number.

998629 is a deficient number, since it is larger than the sum of its proper divisors (1).

998629 is an equidigital number, since it uses as much as digits as its factorization.

998629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 43.

The square root of 998629 is about 999.3142648837. The cubic root of 998629 is about 99.9542790992.

The spelling of 998629 in words is "nine hundred ninety-eight thousand, six hundred twenty-nine".