388666861 has 8 divisors (see below), whose sum is σ = 432000864. Its totient is φ = 346666320.

The previous prime is 388666849. The next prime is 388666877. The reversal of 388666861 is 168666883.

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

It is not a de Polignac number, because 388666861 - 2¹¹ = 388664813 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 388666799 and 388666808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388666361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 332751 + ... + 333916.

It is an arithmetic number, because the mean of its divisors is an integer number (54000108).

Almost surely, 2^388666861 is an apocalyptic number.

It is an amenable number.

388666861 is a deficient number, since it is larger than the sum of its proper divisors (43334003).

388666861 is a wasteful number, since it uses less digits than its factorization.

388666861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666731.

The product of its digits is 1990656, while the sum is 52.

The square root of 388666861 is about 19714.6357054854. The cubic root of 388666861 is about 729.7809194337.

The spelling of 388666861 in words is "three hundred eighty-eight million, six hundred sixty-six thousand, eight hundred sixty-one".