388668421 has 8 divisors (see below), whose sum is σ = 418650624. Its totient is φ = 359776560.

The previous prime is 388668409. The next prime is 388668457. The reversal of 388668421 is 124866883.

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 388668421 - 2¹⁷ = 388537349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388668481) 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 7 ways as a sum of consecutive naturals, for example, 271846 + ... + 273271.

It is an arithmetic number, because the mean of its divisors is an integer number (52331328).

Almost surely, 2^388668421 is an apocalyptic number.

388668421 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

388668421 is a deficient number, since it is larger than the sum of its proper divisors (29982203).

388668421 is a wasteful number, since it uses less digits than its factorization.

388668421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545171.

The product of its digits is 442368, while the sum is 46.

The square root of 388668421 is about 19714.6752699607. The cubic root of 388668421 is about 729.7818958112.

The spelling of 388668421 in words is "three hundred eighty-eight million, six hundred sixty-eight thousand, four hundred twenty-one".