388069391 has 2 divisors, whose sum is σ = 388069392. Its totient is φ = 388069390.

The previous prime is 388069361. The next prime is 388069397. The reversal of 388069391 is 193960883.

It is a strong prime.

It is an emirp because it is prime and its reverse (193960883) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-388069391 is a prime.

It is a super-2 number, since 2×388069391² = 301195704462221762, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (388069397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194034695 + 194034696.

It is an arithmetic number, because the mean of its divisors is an integer number (194034696).

Almost surely, 2^388069391 is an apocalyptic number.

388069391 is a deficient number, since it is larger than the sum of its proper divisors (1).

388069391 is an equidigital number, since it uses as much as digits as its factorization.

388069391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 388069391 is about 19699.4769219896. The cubic root of 388069391 is about 729.4067808395.

The spelling of 388069391 in words is "three hundred eighty-eight million, sixty-nine thousand, three hundred ninety-one".