388505231 has 2 divisors, whose sum is σ = 388505232. Its totient is φ = 388505230.

The previous prime is 388505209. The next prime is 388505263. The reversal of 388505231 is 132505883.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-388505231 is a prime.

It is a super-2 number, since 2×388505231² = 301872629028726722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 388505191 and 388505200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (348505231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194252615 + 194252616.

It is an arithmetic number, because the mean of its divisors is an integer number (194252616).

Almost surely, 2^388505231 is an apocalyptic number.

388505231 is a deficient number, since it is larger than the sum of its proper divisors (1).

388505231 is an equidigital number, since it uses as much as digits as its factorization.

388505231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 388505231 is about 19710.5360404024. The cubic root of 388505231 is about 729.6797438029.

The spelling of 388505231 in words is "three hundred eighty-eight million, five hundred five thousand, two hundred thirty-one".