26972809 has 2 divisors, whose sum is σ = 26972810. Its totient is φ = 26972808.

The previous prime is 26972807. The next prime is 26972819. The reversal of 26972809 is 90827962.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25532809 + 1440000 = 5053^2 + 1200^2 .

It is a cyclic number.

It is not a de Polignac number, because 26972809 - 2¹ = 26972807 is a prime.

Together with 26972807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (26972807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13486404 + 13486405.

It is an arithmetic number, because the mean of its divisors is an integer number (13486405).

Almost surely, 2^26972809 is an apocalyptic number.

It is an amenable number.

26972809 is a deficient number, since it is larger than the sum of its proper divisors (1).

26972809 is an equidigital number, since it uses as much as digits as its factorization.

26972809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 26972809 is about 5193.5353084388. The cubic root of 26972809 is about 299.8992587671.

The spelling of 26972809 in words is "twenty-six million, nine hundred seventy-two thousand, eight hundred nine".