398042417 has 2 divisors, whose sum is σ = 398042418. Its totient is φ = 398042416.

The previous prime is 398042383. The next prime is 398042423. The reversal of 398042417 is 714240893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 398042401 + 16 = 19951^2 + 4^2 .

It is an emirp because it is prime and its reverse (714240893) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398042417 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (398042467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199021208 + 199021209.

It is an arithmetic number, because the mean of its divisors is an integer number (199021209).

Almost surely, 2^398042417 is an apocalyptic number.

It is an amenable number.

398042417 is a deficient number, since it is larger than the sum of its proper divisors (1).

398042417 is an equidigital number, since it uses as much as digits as its factorization.

398042417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 398042417 is about 19951.0004009824. Note that the first 3 decimals coincide. The cubic root of 398042417 is about 735.6023673501.

The spelling of 398042417 in words is "three hundred ninety-eight million, forty-two thousand, four hundred seventeen".