26938781 has 2 divisors, whose sum is σ = 26938782. Its totient is φ = 26938780.

The previous prime is 26938711. The next prime is 26938817. The reversal of 26938781 is 18783962.

Together with next prime (26938817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13942756 + 12996025 = 3734^2 + 3605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26938781 is a prime.

It is a super-2 number, since 2×26938781² = 1451395843531922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26938711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13469390 + 13469391.

It is an arithmetic number, because the mean of its divisors is an integer number (13469391).

Almost surely, 2^26938781 is an apocalyptic number.

It is an amenable number.

26938781 is a deficient number, since it is larger than the sum of its proper divisors (1).

26938781 is an equidigital number, since it uses as much as digits as its factorization.

26938781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 44.

The square root of 26938781 is about 5190.2582787372. The cubic root of 26938781 is about 299.7730913812.

The spelling of 26938781 in words is "twenty-six million, nine hundred thirty-eight thousand, seven hundred eighty-one".