388390428 has 18 divisors (see below), whose sum is σ = 981764784. Its totient is φ = 129463464.

The previous prime is 388390427. The next prime is 388390433. The reversal of 388390428 is 824093883.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388390421) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5394276 + ... + 5394347.

It is an arithmetic number, because the mean of its divisors is an integer number (54542488).

Almost surely, 2^388390428 is an apocalyptic number.

It is an amenable number.

388390428 is an abundant number, since it is smaller than the sum of its proper divisors (593374356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

388390428 is a wasteful number, since it uses less digits than its factorization.

388390428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10788633 (or 10788628 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The square root of 388390428 is about 19707.6236010332. The cubic root of 388390428 is about 729.6078634526.

The spelling of 388390428 in words is "three hundred eighty-eight million, three hundred ninety thousand, four hundred twenty-eight".