26398643 has 2 divisors, whose sum is σ = 26398644. Its totient is φ = 26398642.

The previous prime is 26398627. The next prime is 26398651. The reversal of 26398643 is 34689362.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26398643 - 2⁴ = 26398627 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26398643.

It is not a weakly prime, because it can be changed into another prime (26398663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13199321 + 13199322.

It is an arithmetic number, because the mean of its divisors is an integer number (13199322).

Almost surely, 2^26398643 is an apocalyptic number.

26398643 is a deficient number, since it is larger than the sum of its proper divisors (1).

26398643 is an equidigital number, since it uses as much as digits as its factorization.

26398643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 41.

The square root of 26398643 is about 5137.9609768857. The cubic root of 26398643 is about 297.7560087126.

The spelling of 26398643 in words is "twenty-six million, three hundred ninety-eight thousand, six hundred forty-three".