388187641 has 2 divisors, whose sum is σ = 388187642. Its totient is φ = 388187640.

The previous prime is 388187603. The next prime is 388187669. The reversal of 388187641 is 146781883.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 385297641 + 2890000 = 19629^2 + 1700^2 .

It is a cyclic number.

It is not a de Polignac number, because 388187641 - 2²³ = 379799033 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 388187591 and 388187600.

It is not a weakly prime, because it can be changed into another prime (388187141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194093820 + 194093821.

It is an arithmetic number, because the mean of its divisors is an integer number (194093821).

Almost surely, 2^388187641 is an apocalyptic number.

It is an amenable number.

388187641 is a deficient number, since it is larger than the sum of its proper divisors (1).

388187641 is an equidigital number, since it uses as much as digits as its factorization.

388187641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 258048, while the sum is 46.

The square root of 388187641 is about 19702.4780421144. The cubic root of 388187641 is about 729.4808600244.

The spelling of 388187641 in words is "three hundred eighty-eight million, one hundred eighty-seven thousand, six hundred forty-one".