26139749 has 2 divisors, whose sum is σ = 26139750. Its totient is φ = 26139748.

The previous prime is 26139739. The next prime is 26139787. The reversal of 26139749 is 94793162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21687649 + 4452100 = 4657^2 + 2110^2 .

It is a cyclic number.

It is not a de Polignac number, because 26139749 - 2⁸ = 26139493 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 (26139739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13069874 + 13069875.

It is an arithmetic number, because the mean of its divisors is an integer number (13069875).

Almost surely, 2^26139749 is an apocalyptic number.

It is an amenable number.

26139749 is a deficient number, since it is larger than the sum of its proper divisors (1).

26139749 is an equidigital number, since it uses as much as digits as its factorization.

26139749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 41.

The square root of 26139749 is about 5112.7046658300. The cubic root of 26139749 is about 296.7794354496.

The spelling of 26139749 in words is "twenty-six million, one hundred thirty-nine thousand, seven hundred forty-nine".