268538393 has 2 divisors, whose sum is σ = 268538394. Its totient is φ = 268538392.

The previous prime is 268538359. The next prime is 268538411. The reversal of 268538393 is 393835862.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 268533769 + 4624 = 16387^2 + 68^2 .

It is a cyclic number.

It is not a de Polignac number, because 268538393 - 2⁶ = 268538329 is a prime.

It is a super-2 number, since 2×268538393² = 144225737030044898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (268538353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134269196 + 134269197.

It is an arithmetic number, because the mean of its divisors is an integer number (134269197).

Almost surely, 2^268538393 is an apocalyptic number.

It is an amenable number.

268538393 is a deficient number, since it is larger than the sum of its proper divisors (1).

268538393 is an equidigital number, since it uses as much as digits as its factorization.

268538393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 933120, while the sum is 47.

The square root of 268538393 is about 16387.1410868400. The cubic root of 268538393 is about 645.1620232751.

The spelling of 268538393 in words is "two hundred sixty-eight million, five hundred thirty-eight thousand, three hundred ninety-three".