388666223 has 16 divisors (see below), whose sum is σ = 472573440. Its totient is φ = 315043200.

The previous prime is 388666219. The next prime is 388666279. The reversal of 388666223 is 322666883.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 388666223 - 2² = 388666219 is a prime.

It is a super-2 number, since 2×388666223² = 302122865802171458, 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 (328666223) 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 15 ways as a sum of consecutive naturals, for example, 51143 + ... + 58248.

It is an arithmetic number, because the mean of its divisors is an integer number (29535840).

Almost surely, 2^388666223 is an apocalyptic number.

388666223 is a deficient number, since it is larger than the sum of its proper divisors (83907217).

388666223 is a wasteful number, since it uses less digits than its factorization.

388666223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109438.

The product of its digits is 497664, while the sum is 44.

The square root of 388666223 is about 19714.6195246066. The cubic root of 388666223 is about 729.7805201196.

The spelling of 388666223 in words is "three hundred eighty-eight million, six hundred sixty-six thousand, two hundred twenty-three".