26129729 has 2 divisors, whose sum is σ = 26129730. Its totient is φ = 26129728.

The previous prime is 26129711. The next prime is 26129749. The reversal of 26129729 is 92792162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13690000 + 12439729 = 3700^2 + 3527^2 .

It is a cyclic number.

It is not a de Polignac number, because 26129729 - 2⁸ = 26129473 is a prime.

It is a super-2 number, since 2×26129729² = 1365525475226882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 26129692 and 26129701.

It is not a weakly prime, because it can be changed into another prime (26129749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13064864 + 13064865.

It is an arithmetic number, because the mean of its divisors is an integer number (13064865).

Almost surely, 2^26129729 is an apocalyptic number.

It is an amenable number.

26129729 is a deficient number, since it is larger than the sum of its proper divisors (1).

26129729 is an equidigital number, since it uses as much as digits as its factorization.

26129729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 38.

The square root of 26129729 is about 5111.7246600340. The cubic root of 26129729 is about 296.7415096838.

The spelling of 26129729 in words is "twenty-six million, one hundred twenty-nine thousand, seven hundred twenty-nine".