388889311 has 2 divisors, whose sum is σ = 388889312. Its totient is φ = 388889310.

The previous prime is 388889273. The next prime is 388889317. The reversal of 388889311 is 113988883.

It is a strong prime.

It is an emirp because it is prime and its reverse (113988883) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 388889311 - 2¹¹ = 388887263 is a prime.

It is a super-4 number, since 4×388889311⁴ (a number of 35 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (388889317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194444655 + 194444656.

It is an arithmetic number, because the mean of its divisors is an integer number (194444656).

Almost surely, 2^388889311 is an apocalyptic number.

388889311 is a deficient number, since it is larger than the sum of its proper divisors (1).

388889311 is an equidigital number, since it uses as much as digits as its factorization.

388889311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 331776, while the sum is 49.

The square root of 388889311 is about 19720.2766461325. The cubic root of 388889311 is about 729.9201207398.

The spelling of 388889311 in words is "three hundred eighty-eight million, eight hundred eighty-nine thousand, three hundred eleven".