978749 has 2 divisors, whose sum is σ = 978750. Its totient is φ = 978748.

The previous prime is 978743. The next prime is 978773. The reversal of 978749 is 947879.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 931225 + 47524 = 965^2 + 218^2 .

It is a cyclic number.

It is not a de Polignac number, because 978749 - 2¹² = 974653 is a prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (978743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489374 + 489375.

It is an arithmetic number, because the mean of its divisors is an integer number (489375).

2⁹⁷⁸⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

978749 is a deficient number, since it is larger than the sum of its proper divisors (1).

978749 is an equidigital number, since it uses as much as digits as its factorization.

978749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 44.

The square root of 978749 is about 989.3174414716. The cubic root of 978749 is about 99.2865554063.

The spelling of 978749 in words is "nine hundred seventy-eight thousand, seven hundred forty-nine".