388134431 has 2 divisors, whose sum is σ = 388134432. Its totient is φ = 388134430.

The previous prime is 388134427. The next prime is 388134433. The reversal of 388134431 is 134431883.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 388134431 - 2² = 388134427 is a prime.

It is a super-2 number, since 2×388134431² = 301296673055387522, which contains 22 as substring.

Together with 388134433, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 388134391 and 388134400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (388134433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194067215 + 194067216.

It is an arithmetic number, because the mean of its divisors is an integer number (194067216).

Almost surely, 2^388134431 is an apocalyptic number.

388134431 is a deficient number, since it is larger than the sum of its proper divisors (1).

388134431 is an equidigital number, since it uses as much as digits as its factorization.

388134431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 35.

The square root of 388134431 is about 19701.1276580809. The cubic root of 388134431 is about 729.4475278193.

The spelling of 388134431 in words is "three hundred eighty-eight million, one hundred thirty-four thousand, four hundred thirty-one".