388844681 has 2 divisors, whose sum is σ = 388844682. Its totient is φ = 388844680.

The previous prime is 388844609. The next prime is 388844699. The reversal of 388844681 is 186448883.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 236544400 + 152300281 = 15380^2 + 12341^2 .

It is a cyclic number.

It is not a de Polignac number, because 388844681 - 2²² = 384650377 is a prime.

It is a super-2 number, since 2×388844681² = 302400371883983522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (388844381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194422340 + 194422341.

It is an arithmetic number, because the mean of its divisors is an integer number (194422341).

Almost surely, 2^388844681 is an apocalyptic number.

It is an amenable number.

388844681 is a deficient number, since it is larger than the sum of its proper divisors (1).

388844681 is an equidigital number, since it uses as much as digits as its factorization.

388844681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1179648, while the sum is 50.

The square root of 388844681 is about 19719.1450372474. The cubic root of 388844681 is about 729.8921971291.

The spelling of 388844681 in words is "three hundred eighty-eight million, eight hundred forty-four thousand, six hundred eighty-one".