26399129 has 2 divisors, whose sum is σ = 26399130. Its totient is φ = 26399128.

The previous prime is 26399117. The next prime is 26399159. The reversal of 26399129 is 92199362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13987600 + 12411529 = 3740^2 + 3523^2 .

It is a cyclic number.

It is not a de Polignac number, because 26399129 - 2⁸ = 26398873 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (26399159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13199564 + 13199565.

It is an arithmetic number, because the mean of its divisors is an integer number (13199565).

Almost surely, 2^26399129 is an apocalyptic number.

It is an amenable number.

26399129 is a deficient number, since it is larger than the sum of its proper divisors (1).

26399129 is an equidigital number, since it uses as much as digits as its factorization.

26399129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52488, while the sum is 41.

The square root of 26399129 is about 5138.0082716944. The cubic root of 26399129 is about 297.7578359345.

The spelling of 26399129 in words is "twenty-six million, three hundred ninety-nine thousand, one hundred twenty-nine".