388218933 has 16 divisors (see below), whose sum is σ = 577555200. Its totient is φ = 257725440.

The previous prime is 388218931. The next prime is 388218937. The reversal of 388218933 is 339812883.

It is not a de Polignac number, because 388218933 - 2¹ = 388218931 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388218931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23628 + ... + 36533.

It is an arithmetic number, because the mean of its divisors is an integer number (36097200).

Almost surely, 2^388218933 is an apocalyptic number.

It is an amenable number.

388218933 is a deficient number, since it is larger than the sum of its proper divisors (189336267).

388218933 is a wasteful number, since it uses less digits than its factorization.

388218933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60409 (or 60403 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 388218933 is about 19703.2721394189. The cubic root of 388218933 is about 729.5004607702.

The spelling of 388218933 in words is "three hundred eighty-eight million, two hundred eighteen thousand, nine hundred thirty-three".