388854921 has 32 divisors (see below), whose sum is σ = 639959040. Its totient is φ = 204519744.

The previous prime is 388854887. The next prime is 388854943. The reversal of 388854921 is 129458883.

It is a de Polignac number, because none of the positive numbers 2^k-388854921 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (388854971) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102700 + ... + 106418.

It is an arithmetic number, because the mean of its divisors is an integer number (19998720).

Almost surely, 2^388854921 is an apocalyptic number.

It is an amenable number.

388854921 is a deficient number, since it is larger than the sum of its proper divisors (251104119).

388854921 is a wasteful number, since it uses less digits than its factorization.

388854921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4125.

The product of its digits is 552960, while the sum is 48.

The square root of 388854921 is about 19719.4046816835. The cubic root of 388854921 is about 729.8986041693.

The spelling of 388854921 in words is "three hundred eighty-eight million, eight hundred fifty-four thousand, nine hundred twenty-one".