388712081 has 2 divisors, whose sum is σ = 388712082. Its totient is φ = 388712080.

The previous prime is 388712063. The next prime is 388712117. The reversal of 388712081 is 180217883.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 234579856 + 154132225 = 15316^2 + 12415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-388712081 is a prime.

It is a super-2 number, since 2×388712081² = 302194163830701122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (388712011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194356040 + 194356041.

It is an arithmetic number, because the mean of its divisors is an integer number (194356041).

Almost surely, 2^388712081 is an apocalyptic number.

It is an amenable number.

388712081 is a deficient number, since it is larger than the sum of its proper divisors (1).

388712081 is an equidigital number, since it uses as much as digits as its factorization.

388712081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21504, while the sum is 38.

The square root of 388712081 is about 19715.7825358265. The cubic root of 388712081 is about 729.8092208033.

The spelling of 388712081 in words is "three hundred eighty-eight million, seven hundred twelve thousand, eighty-one".