398888887 has 2 divisors, whose sum is σ = 398888888. Its totient is φ = 398888886.

The previous prime is 398888857. The next prime is 398888899. The reversal of 398888887 is 788888893.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398888887 is a prime.

It is a super-2 number, since 2×398888887² = 318224688344197538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398888857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199444443 + 199444444.

It is an arithmetic number, because the mean of its divisors is an integer number (199444444).

Almost surely, 2^398888887 is an apocalyptic number.

398888887 is a deficient number, since it is larger than the sum of its proper divisors (1).

398888887 is an equidigital number, since it uses as much as digits as its factorization.

398888887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49545216, while the sum is 67.

The square root of 398888887 is about 19972.2028579724. The cubic root of 398888887 is about 736.1234378415.

The spelling of 398888887 in words is "three hundred ninety-eight million, eight hundred eighty-eight thousand, eight hundred eighty-seven".