387681889 has 16 divisors (see below), whose sum is σ = 485308800. Its totient is φ = 301964544.

The previous prime is 387681881. The next prime is 387681907. The reversal of 387681889 is 988186783.

It is not a de Polignac number, because 387681889 - 2³ = 387681881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (387681881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52719 + ... + 59620.

It is an arithmetic number, because the mean of its divisors is an integer number (30331800).

Almost surely, 2^387681889 is an apocalyptic number.

It is an amenable number.

387681889 is a deficient number, since it is larger than the sum of its proper divisors (97626911).

387681889 is a wasteful number, since it uses less digits than its factorization.

387681889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112392.

The product of its digits is 4644864, while the sum is 58.

The square root of 387681889 is about 19689.6391282319. The cubic root of 387681889 is about 729.1639198779.

It can be divided in two parts, 387 and 681889, that added together give a square (682276 = 826²).

The spelling of 387681889 in words is "three hundred eighty-seven million, six hundred eighty-one thousand, eight hundred eighty-nine".