26398987 has 2 divisors, whose sum is σ = 26398988. Its totient is φ = 26398986.

The previous prime is 26398979. The next prime is 26398993. The reversal of 26398987 is 78989362.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26398987 - 2³ = 26398979 is a prime.

It is not a weakly prime, because it can be changed into another prime (26398907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13199493 + 13199494.

It is an arithmetic number, because the mean of its divisors is an integer number (13199494).

Almost surely, 2^26398987 is an apocalyptic number.

26398987 is a deficient number, since it is larger than the sum of its proper divisors (1).

26398987 is an equidigital number, since it uses as much as digits as its factorization.

26398987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1306368, while the sum is 52.

The square root of 26398987 is about 5137.9944530916. The cubic root of 26398987 is about 297.7573020571.

The spelling of 26398987 in words is "twenty-six million, three hundred ninety-eight thousand, nine hundred eighty-seven".