388408816 has 20 divisors (see below), whose sum is σ = 761000400. Its totient is φ = 192021632.

The previous prime is 388408781. The next prime is 388408817. The reversal of 388408816 is 618804883.

It is a super-2 number, since 2×388408816² = 301722816693043712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388408817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134956 + ... + 137803.

It is an arithmetic number, because the mean of its divisors is an integer number (38050020).

Almost surely, 2^388408816 is an apocalyptic number.

It is an amenable number.

388408816 is a deficient number, since it is larger than the sum of its proper divisors (372591584).

388408816 is a wasteful number, since it uses less digits than its factorization.

388408816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272856 (or 272850 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 46.

The square root of 388408816 is about 19708.0901154830. The cubic root of 388408816 is about 729.6193774831.

The spelling of 388408816 in words is "three hundred eighty-eight million, four hundred eight thousand, eight hundred sixteen".