26540399 has 2 divisors, whose sum is σ = 26540400. Its totient is φ = 26540398.

The previous prime is 26540389. The next prime is 26540401. The reversal of 26540399 is 99304562.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26540399 is a prime.

It is a Sophie Germain prime.

Together with 26540401, 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 (26540389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13270199 + 13270200.

It is an arithmetic number, because the mean of its divisors is an integer number (13270200).

Almost surely, 2^26540399 is an apocalyptic number.

26540399 is a deficient number, since it is larger than the sum of its proper divisors (1).

26540399 is an equidigital number, since it uses as much as digits as its factorization.

26540399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 26540399 is about 5151.7374739014. The cubic root of 26540399 is about 298.2880231081.

The spelling of 26540399 in words is "twenty-six million, five hundred forty thousand, three hundred ninety-nine".