398438771 has 2 divisors, whose sum is σ = 398438772. Its totient is φ = 398438770.

The previous prime is 398438737. The next prime is 398438773. The reversal of 398438771 is 177834893.

It is a strong prime.

It is an emirp because it is prime and its reverse (177834893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 398438771 - 2¹⁰ = 398437747 is a prime.

Together with 398438773, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (398438773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199219385 + 199219386.

It is an arithmetic number, because the mean of its divisors is an integer number (199219386).

Almost surely, 2^398438771 is an apocalyptic number.

398438771 is a deficient number, since it is larger than the sum of its proper divisors (1).

398438771 is an equidigital number, since it uses as much as digits as its factorization.

398438771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 50.

The square root of 398438771 is about 19960.9311155567. The cubic root of 398438771 is about 735.8464470492.

The spelling of 398438771 in words is "three hundred ninety-eight million, four hundred thirty-eight thousand, seven hundred seventy-one".