989749 has 2 divisors, whose sum is σ = 989750. Its totient is φ = 989748.

The previous prime is 989743. The next prime is 989753. The reversal of 989749 is 947989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 611524 + 378225 = 782^2 + 615^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-989749 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 989699 and 989708.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494874 + 494875.

It is an arithmetic number, because the mean of its divisors is an integer number (494875).

2⁹⁸⁹⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

989749 is a deficient number, since it is larger than the sum of its proper divisors (1).

989749 is an equidigital number, since it uses as much as digits as its factorization.

989749 is an odious number, because the sum of its binary digits is odd.

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

The square root of 989749 is about 994.8612968650. The cubic root of 989749 is about 99.6571257159.

The spelling of 989749 in words is "nine hundred eighty-nine thousand, seven hundred forty-nine".