398566247 has 2 divisors, whose sum is σ = 398566248. Its totient is φ = 398566246.

The previous prime is 398566229. The next prime is 398566261. The reversal of 398566247 is 742665893.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398566247 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 398566195 and 398566204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398566277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199283123 + 199283124.

It is an arithmetic number, because the mean of its divisors is an integer number (199283124).

Almost surely, 2^398566247 is an apocalyptic number.

398566247 is a deficient number, since it is larger than the sum of its proper divisors (1).

398566247 is an equidigital number, since it uses as much as digits as its factorization.

398566247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 50.

The square root of 398566247 is about 19964.1239978117. The cubic root of 398566247 is about 735.9249139443.

The spelling of 398566247 in words is "three hundred ninety-eight million, five hundred sixty-six thousand, two hundred forty-seven".