268438493 has 2 divisors, whose sum is σ = 268438494. Its totient is φ = 268438492.

The previous prime is 268438459. The next prime is 268438501. The reversal of 268438493 is 394834862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 234763684 + 33674809 = 15322^2 + 5803^2 .

It is a cyclic number.

It is not a de Polignac number, because 268438493 - 2¹⁰ = 268437469 is a prime.

It is a super-2 number, since 2×268438493² = 144118449048222098, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268435493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134219246 + 134219247.

It is an arithmetic number, because the mean of its divisors is an integer number (134219247).

Almost surely, 2^268438493 is an apocalyptic number.

It is an amenable number.

268438493 is a deficient number, since it is larger than the sum of its proper divisors (1).

268438493 is an equidigital number, since it uses as much as digits as its factorization.

268438493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 47.

The square root of 268438493 is about 16384.0926816226. The cubic root of 268438493 is about 645.0820102840.

The spelling of 268438493 in words is "two hundred sixty-eight million, four hundred thirty-eight thousand, four hundred ninety-three".