888398991 has 12 divisors (see below), whose sum is σ = 1286822160. Its totient is φ = 590614080.

The previous prime is 888398981. The next prime is 888398993. The reversal of 888398991 is 199893888.

It is not a de Polignac number, because 888398991 - 2²¹ = 886301839 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (888398993) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 134250 + ... + 140711.

It is an arithmetic number, because the mean of its divisors is an integer number (107235180).

Almost surely, 2^888398991 is an apocalyptic number.

888398991 is a deficient number, since it is larger than the sum of its proper divisors (398423169).

888398991 is a wasteful number, since it uses less digits than its factorization.

888398991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275326 (or 275323 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 63.

The square root of 888398991 is about 29806.0227303141. The cubic root of 888398991 is about 961.3230423228.

The spelling of 888398991 in words is "eight hundred eighty-eight million, three hundred ninety-eight thousand, nine hundred ninety-one".