388534681 has 8 divisors (see below), whose sum is σ = 395240328. Its totient is φ = 381840000.

The previous prime is 388534673. The next prime is 388534693. The reversal of 388534681 is 186435883.

It can be written as a sum of positive squares in 4 ways, for example, as 10621081 + 377913600 = 3259^2 + 19440^2 .

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 388534681 - 2³ = 388534673 is a prime.

It is a super-2 number, since 2×388534681² = 301918396679543522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (388534661) 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, 103131 + ... + 106831.

It is an arithmetic number, because the mean of its divisors is an integer number (49405041).

Almost surely, 2^388534681 is an apocalyptic number.

It is an amenable number.

388534681 is a deficient number, since it is larger than the sum of its proper divisors (6705647).

388534681 is a wasteful number, since it uses less digits than its factorization.

388534681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5483.

The product of its digits is 552960, while the sum is 46.

The square root of 388534681 is about 19711.2830886272. The cubic root of 388534681 is about 729.6981807279.

It can be divided in two parts, 38853 and 4681, that added together give a palindrome (43534).

The spelling of 388534681 in words is "three hundred eighty-eight million, five hundred thirty-four thousand, six hundred eighty-one".