388686887 has 8 divisors (see below), whose sum is σ = 399677616. Its totient is φ = 377721792.

The previous prime is 388686869. The next prime is 388686889. The reversal of 388686887 is 788686883.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 388686887 - 2²⁰ = 387638311 is a prime.

It is a super-2 number, since 2×388686887² = 302154992251501538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388686889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26723 + ... + 38619.

It is an arithmetic number, because the mean of its divisors is an integer number (49959702).

Almost surely, 2^388686887 is an apocalyptic number.

388686887 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

388686887 is a deficient number, since it is larger than the sum of its proper divisors (10990729).

388686887 is a wasteful number, since it uses less digits than its factorization.

388686887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12817.

The product of its digits is 24772608, while the sum is 62.

The square root of 388686887 is about 19715.1435957236. The cubic root of 388686887 is about 729.7934531681.

The spelling of 388686887 in words is "three hundred eighty-eight million, six hundred eighty-six thousand, eight hundred eighty-seven".