388391 has 2 divisors, whose sum is σ = 388392. Its totient is φ = 388390.

The previous prime is 388373. The next prime is 388403. The reversal of 388391 is 193883.

It is a strong prime.

It is an emirp because it is prime and its reverse (193883) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-388391 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (388301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194195 + 194196.

It is an arithmetic number, because the mean of its divisors is an integer number (194196).

2³⁸⁸³⁹¹ is an apocalyptic number.

388391 is a deficient number, since it is larger than the sum of its proper divisors (1).

388391 is an equidigital number, since it uses as much as digits as its factorization.

388391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

The square root of 388391 is about 623.2102373999. The cubic root of 388391 is about 72.9608221628.

It can be divided in two parts, 3883 and 91, that multiplied together give a palindrome (353353).

The spelling of 388391 in words is "three hundred eighty-eight thousand, three hundred ninety-one".