388442621 has 8 divisors (see below), whose sum is σ = 446260224. Its totient is φ = 331206480.

The previous prime is 388442603. The next prime is 388442689. The reversal of 388442621 is 126244883.

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 388442621 - 2¹⁰ = 388441597 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 (384442621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143930 + ... + 146603.

It is an arithmetic number, because the mean of its divisors is an integer number (55782528).

Almost surely, 2^388442621 is an apocalyptic number.

It is an amenable number.

388442621 is a deficient number, since it is larger than the sum of its proper divisors (57817603).

388442621 is a wasteful number, since it uses less digits than its factorization.

388442621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290731.

The product of its digits is 73728, while the sum is 38.

The square root of 388442621 is about 19708.9477395421. The cubic root of 388442621 is about 729.6405442422.

The spelling of 388442621 in words is "three hundred eighty-eight million, four hundred forty-two thousand, six hundred twenty-one".