388781828 has 6 divisors (see below), whose sum is σ = 680368206. Its totient is φ = 194390912.

The previous prime is 388781759. The next prime is 388781849. The reversal of 388781828 is 828187883.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 384081604 + 4700224 = 19598^2 + 2168^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 388781828.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 48597725 + ... + 48597732.

It is an arithmetic number, because the mean of its divisors is an integer number (113394701).

Almost surely, 2^388781828 is an apocalyptic number.

It is an amenable number.

388781828 is a deficient number, since it is larger than the sum of its proper divisors (291586378).

388781828 is a wasteful number, since it uses less digits than its factorization.

388781828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97195461 (or 97195459 counting only the distinct ones).

The product of its digits is 1376256, while the sum is 53.

The square root of 388781828 is about 19717.5512678426. The cubic root of 388781828 is about 729.8528683272.

The spelling of 388781828 in words is "three hundred eighty-eight million, seven hundred eighty-one thousand, eight hundred twenty-eight".