388334381 has 2 divisors, whose sum is σ = 388334382. Its totient is φ = 388334380.

The previous prime is 388334327. The next prime is 388334449. The reversal of 388334381 is 183433883.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 254562025 + 133772356 = 15955^2 + 11566^2 .

It is an emirp because it is prime and its reverse (183433883) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 388334381 - 2²⁶ = 321225517 is a prime.

It is a super-2 number, since 2×388334381² = 301607182933306322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (388330381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194167190 + 194167191.

It is an arithmetic number, because the mean of its divisors is an integer number (194167191).

Almost surely, 2^388334381 is an apocalyptic number.

It is an amenable number.

388334381 is a deficient number, since it is larger than the sum of its proper divisors (1).

388334381 is an equidigital number, since it uses as much as digits as its factorization.

388334381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 41.

The square root of 388334381 is about 19706.2015873176. The cubic root of 388334381 is about 729.5727662101.

The spelling of 388334381 in words is "three hundred eighty-eight million, three hundred thirty-four thousand, three hundred eighty-one".