398774329 has 2 divisors, whose sum is σ = 398774330. Its totient is φ = 398774328.

The previous prime is 398774291. The next prime is 398774339. The reversal of 398774329 is 923477893.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 393109929 + 5664400 = 19827^2 + 2380^2 .

It is a cyclic number.

It is not a de Polignac number, because 398774329 - 2¹⁷ = 398643257 is a prime.

It is not a weakly prime, because it can be changed into another prime (398774339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199387164 + 199387165.

It is an arithmetic number, because the mean of its divisors is an integer number (199387165).

Almost surely, 2^398774329 is an apocalyptic number.

It is an amenable number.

398774329 is a deficient number, since it is larger than the sum of its proper divisors (1).

398774329 is an equidigital number, since it uses as much as digits as its factorization.

398774329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2286144, while the sum is 52.

The square root of 398774329 is about 19969.3347160089. The cubic root of 398774329 is about 736.0529613206.

The spelling of 398774329 in words is "three hundred ninety-eight million, seven hundred seventy-four thousand, three hundred twenty-nine".