398626439 has 2 divisors, whose sum is σ = 398626440. Its totient is φ = 398626438.

The previous prime is 398626381. The next prime is 398626451. The reversal of 398626439 is 934626893.

It is a strong prime.

It is an emirp because it is prime and its reverse (934626893) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398626439 is a prime.

It is a Sophie Germain 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 (398626499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199313219 + 199313220.

It is an arithmetic number, because the mean of its divisors is an integer number (199313220).

Almost surely, 2^398626439 is an apocalyptic number.

398626439 is a deficient number, since it is larger than the sum of its proper divisors (1).

398626439 is an equidigital number, since it uses as much as digits as its factorization.

398626439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 50.

The square root of 398626439 is about 19965.6314450608. The cubic root of 398626439 is about 735.9619588630.

The spelling of 398626439 in words is "three hundred ninety-eight million, six hundred twenty-six thousand, four hundred thirty-nine".