1398888866 has 16 divisors (see below), whose sum is σ = 2127148800. Its totient is φ = 689858208.

The previous prime is 1398888839. The next prime is 1398888937. The reversal of 1398888866 is 6688888931.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163790 + ... + 172118.

It is an arithmetic number, because the mean of its divisors is an integer number (132946800).

Almost surely, 2^1398888866 is an apocalyptic number.

1398888866 is a deficient number, since it is larger than the sum of its proper divisors (728259934).

1398888866 is a wasteful number, since it uses less digits than its factorization.

1398888866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9473.

The product of its digits is 31850496, while the sum is 65.

The square root of 1398888866 is about 37401.7227678084. The cubic root of 1398888866 is about 1118.3929081980.

Adding to 1398888866 its sum of digits (65), we get a palindrome (1398888931).

The spelling of 1398888866 in words is "one billion, three hundred ninety-eight million, eight hundred eighty-eight thousand, eight hundred sixty-six".