398508797 has 2 divisors, whose sum is σ = 398508798. Its totient is φ = 398508796.

The previous prime is 398508779. The next prime is 398508811. The reversal of 398508797 is 797805893.

Together with previous prime (398508779) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 329386201 + 69122596 = 18149^2 + 8314^2 .

It is a cyclic number.

It is not a de Polignac number, because 398508797 - 2⁸ = 398508541 is a prime.

It is a super-2 number, since 2×398508797² = 317618522572774418, which contains 22 as substring.

It is a pancake number, because a pancake can be divided into 398508797 parts by 28231 straight cuts.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398501797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199254398 + 199254399.

It is an arithmetic number, because the mean of its divisors is an integer number (199254399).

Almost surely, 2^398508797 is an apocalyptic number.

It is an amenable number.

398508797 is a deficient number, since it is larger than the sum of its proper divisors (1).

398508797 is an equidigital number, since it uses as much as digits as its factorization.

398508797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3810240, while the sum is 56.

The square root of 398508797 is about 19962.6851149839. The cubic root of 398508797 is about 735.8895530993.

The spelling of 398508797 in words is "three hundred ninety-eight million, five hundred eight thousand, seven hundred ninety-seven".