26109389 has 2 divisors, whose sum is σ = 26109390. Its totient is φ = 26109388.

The previous prime is 26109379. The next prime is 26109449. The reversal of 26109389 is 98390162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22372900 + 3736489 = 4730^2 + 1933^2 .

It is a cyclic number.

It is not a de Polignac number, because 26109389 - 2⁴ = 26109373 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26109319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13054694 + 13054695.

It is an arithmetic number, because the mean of its divisors is an integer number (13054695).

Almost surely, 2^26109389 is an apocalyptic number.

It is an amenable number.

26109389 is a deficient number, since it is larger than the sum of its proper divisors (1).

26109389 is an equidigital number, since it uses as much as digits as its factorization.

26109389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 26109389 is about 5109.7347289267. The cubic root of 26109389 is about 296.6644928231.

The spelling of 26109389 in words is "twenty-six million, one hundred nine thousand, three hundred eighty-nine".