26389997 has 2 divisors, whose sum is σ = 26389998. Its totient is φ = 26389996.

The previous prime is 26389963. The next prime is 26389999. The reversal of 26389997 is 79998362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26357956 + 32041 = 5134^2 + 179^2 .

It is a cyclic number.

It is not a de Polignac number, because 26389997 - 2¹⁸ = 26127853 is a prime.

It is a super-3 number, since 3×26389997³ (a number of 23 digits) contains 333 as substring.

Together with 26389999, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26389999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13194998 + 13194999.

It is an arithmetic number, because the mean of its divisors is an integer number (13194999).

Almost surely, 2^26389997 is an apocalyptic number.

It is an amenable number.

26389997 is a deficient number, since it is larger than the sum of its proper divisors (1).

26389997 is an equidigital number, since it uses as much as digits as its factorization.

26389997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1469664, while the sum is 53.

The square root of 26389997 is about 5137.1195236241. The cubic root of 26389997 is about 297.7234984613.

The spelling of 26389997 in words is "twenty-six million, three hundred eighty-nine thousand, nine hundred ninety-seven".