998749 has 2 divisors, whose sum is σ = 998750. Its totient is φ = 998748.

The previous prime is 998743. The next prime is 998759. The reversal of 998749 is 947899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 842724 + 156025 = 918^2 + 395^2 .

It is a cyclic number.

It is not a de Polignac number, because 998749 - 2⁵ = 998717 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 998699 and 998708.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499374 + 499375.

It is an arithmetic number, because the mean of its divisors is an integer number (499375).

2⁹⁹⁸⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

998749 is a deficient number, since it is larger than the sum of its proper divisors (1).

998749 is an equidigital number, since it uses as much as digits as its factorization.

998749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 46.

The square root of 998749 is about 999.3743042524. The cubic root of 998749 is about 99.9582825990.

The spelling of 998749 in words is "nine hundred ninety-eight thousand, seven hundred forty-nine".