26400397 has 2 divisors, whose sum is σ = 26400398. Its totient is φ = 26400396.

The previous prime is 26400383. The next prime is 26400401. The reversal of 26400397 is 79300462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24147396 + 2253001 = 4914^2 + 1501^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26400397 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26400347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13200198 + 13200199.

It is an arithmetic number, because the mean of its divisors is an integer number (13200199).

Almost surely, 2^26400397 is an apocalyptic number.

It is an amenable number.

26400397 is a deficient number, since it is larger than the sum of its proper divisors (1).

26400397 is an equidigital number, since it uses as much as digits as its factorization.

26400397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 26400397 is about 5138.1316643309. The cubic root of 26400397 is about 297.7626031484.

The spelling of 26400397 in words is "twenty-six million, four hundred thousand, three hundred ninety-seven".