398747497 has 2 divisors, whose sum is σ = 398747498. Its totient is φ = 398747496.

The previous prime is 398747473. The next prime is 398747533. The reversal of 398747497 is 794747893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 365153881 + 33593616 = 19109^2 + 5796^2 .

It is an emirp because it is prime and its reverse (794747893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 398747497 - 2⁷ = 398747369 is a prime.

It is not a weakly prime, because it can be changed into another prime (398747417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199373748 + 199373749.

It is an arithmetic number, because the mean of its divisors is an integer number (199373749).

Almost surely, 2^398747497 is an apocalyptic number.

It is an amenable number.

398747497 is a deficient number, since it is larger than the sum of its proper divisors (1).

398747497 is an equidigital number, since it uses as much as digits as its factorization.

398747497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10668672, while the sum is 58.

The square root of 398747497 is about 19968.6628746143. The cubic root of 398747497 is about 736.0364522205.

The spelling of 398747497 in words is "three hundred ninety-eight million, seven hundred forty-seven thousand, four hundred ninety-seven".