26393681 has 2 divisors, whose sum is σ = 26393682. Its totient is φ = 26393680.

The previous prime is 26393677. The next prime is 26393713. The reversal of 26393681 is 18639362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23435281 + 2958400 = 4841^2 + 1720^2 .

It is a cyclic number.

It is not a de Polignac number, because 26393681 - 2² = 26393677 is a prime.

It is a super-2 number, since 2×26393681² = 1393252793459522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26393621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13196840 + 13196841.

It is an arithmetic number, because the mean of its divisors is an integer number (13196841).

Almost surely, 2^26393681 is an apocalyptic number.

It is an amenable number.

26393681 is a deficient number, since it is larger than the sum of its proper divisors (1).

26393681 is an equidigital number, since it uses as much as digits as its factorization.

26393681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 38.

The square root of 26393681 is about 5137.4780778121. The cubic root of 26393681 is about 297.7373517196.

The spelling of 26393681 in words is "twenty-six million, three hundred ninety-three thousand, six hundred eighty-one".