398167493 has 2 divisors, whose sum is σ = 398167494. Its totient is φ = 398167492.

The previous prime is 398167481. The next prime is 398167501. The reversal of 398167493 is 394761893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 229764964 + 168402529 = 15158^2 + 12977^2 .

It is an emirp because it is prime and its reverse (394761893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 398167493 - 2²⁴ = 381390277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398167093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199083746 + 199083747.

It is an arithmetic number, because the mean of its divisors is an integer number (199083747).

Almost surely, 2^398167493 is an apocalyptic number.

It is an amenable number.

398167493 is a deficient number, since it is larger than the sum of its proper divisors (1).

398167493 is an equidigital number, since it uses as much as digits as its factorization.

398167493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 50.

The square root of 398167493 is about 19954.1347344354. The cubic root of 398167493 is about 735.6794081900.

The spelling of 398167493 in words is "three hundred ninety-eight million, one hundred sixty-seven thousand, four hundred ninety-three".