998723749 has 2 divisors, whose sum is σ = 998723750. Its totient is φ = 998723748.

The previous prime is 998723717. The next prime is 998723753. The reversal of 998723749 is 947327899.

998723749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 989542849 + 9180900 = 31457^2 + 3030^2 .

It is a cyclic number.

It is not a de Polignac number, because 998723749 - 2⁵ = 998723717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 998723693 and 998723702.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998723449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499361874 + 499361875.

It is an arithmetic number, because the mean of its divisors is an integer number (499361875).

Almost surely, 2^998723749 is an apocalyptic number.

It is an amenable number.

998723749 is a deficient number, since it is larger than the sum of its proper divisors (1).

998723749 is an equidigital number, since it uses as much as digits as its factorization.

998723749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6858432, while the sum is 58.

The square root of 998723749 is about 31602.5908589786. The cubic root of 998723749 is about 999.5744018919.

The spelling of 998723749 in words is "nine hundred ninety-eight million, seven hundred twenty-three thousand, seven hundred forty-nine".