388936381 has 2 divisors, whose sum is σ = 388936382. Its totient is φ = 388936380.

The previous prime is 388936369. The next prime is 388936393. The reversal of 388936381 is 183639883.

It is a balanced prime because it is at equal distance from previous prime (388936369) and next prime (388936393).

It can be written as a sum of positive squares in only one way, i.e., 377680356 + 11256025 = 19434^2 + 3355^2 .

It is a cyclic number.

It is not a de Polignac number, because 388936381 - 2⁷ = 388936253 is a prime.

It is a super-2 number, since 2×388936381² = 302543016930754322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (388931381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194468190 + 194468191.

It is an arithmetic number, because the mean of its divisors is an integer number (194468191).

Almost surely, 2^388936381 is an apocalyptic number.

It is an amenable number.

388936381 is a deficient number, since it is larger than the sum of its proper divisors (1).

388936381 is an equidigital number, since it uses as much as digits as its factorization.

388936381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 49.

The square root of 388936381 is about 19721.4700516975. The cubic root of 388936381 is about 729.9495686685.

The spelling of 388936381 in words is "three hundred eighty-eight million, nine hundred thirty-six thousand, three hundred eighty-one".