398593397 has 2 divisors, whose sum is σ = 398593398. Its totient is φ = 398593396.

The previous prime is 398593291. The next prime is 398593409. The reversal of 398593397 is 793395893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 390102001 + 8491396 = 19751^2 + 2914^2 .

It is an emirp because it is prime and its reverse (793395893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 398593397 - 2¹⁶ = 398527861 is a prime.

It is a super-2 number, since 2×398593397² = 317753392263999218, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398593697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199296698 + 199296699.

It is an arithmetic number, because the mean of its divisors is an integer number (199296699).

Almost surely, 2^398593397 is an apocalyptic number.

It is an amenable number.

398593397 is a deficient number, since it is larger than the sum of its proper divisors (1).

398593397 is an equidigital number, since it uses as much as digits as its factorization.

398593397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5511240, while the sum is 56.

The square root of 398593397 is about 19964.8039559621. The cubic root of 398593397 is about 735.9416237618.

The spelling of 398593397 in words is "three hundred ninety-eight million, five hundred ninety-three thousand, three hundred ninety-seven".