398593901 has 2 divisors, whose sum is σ = 398593902. Its totient is φ = 398593900.

The previous prime is 398593891. The next prime is 398593931. The reversal of 398593901 is 109395893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 398202025 + 391876 = 19955^2 + 626^2 .

It is an emirp because it is prime and its reverse (109395893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 398593901 - 2¹⁰ = 398592877 is a 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 (398593931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199296950 + 199296951.

It is an arithmetic number, because the mean of its divisors is an integer number (199296951).

Almost surely, 2^398593901 is an apocalyptic number.

It is an amenable number.

398593901 is a deficient number, since it is larger than the sum of its proper divisors (1).

398593901 is an equidigital number, since it uses as much as digits as its factorization.

398593901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 262440, while the sum is 47.

The square root of 398593901 is about 19964.8165781707. The cubic root of 398593901 is about 735.9419339479.

The spelling of 398593901 in words is "three hundred ninety-eight million, five hundred ninety-three thousand, nine hundred one".