398847749 has 2 divisors, whose sum is σ = 398847750. Its totient is φ = 398847748.

The previous prime is 398847739. The next prime is 398847763. The reversal of 398847749 is 947748893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 303003649 + 95844100 = 17407^2 + 9790^2 .

It is a cyclic number.

It is not a de Polignac number, because 398847749 - 2⁴ = 398847733 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398847719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199423874 + 199423875.

It is an arithmetic number, because the mean of its divisors is an integer number (199423875).

Almost surely, 2^398847749 is an apocalyptic number.

It is an amenable number.

398847749 is a deficient number, since it is larger than the sum of its proper divisors (1).

398847749 is an equidigital number, since it uses as much as digits as its factorization.

398847749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12192768, while the sum is 59.

The square root of 398847749 is about 19971.1729500298. The cubic root of 398847749 is about 736.0981311391.

The spelling of 398847749 in words is "three hundred ninety-eight million, eight hundred forty-seven thousand, seven hundred forty-nine".