26721797 has 2 divisors, whose sum is σ = 26721798. Its totient is φ = 26721796.

The previous prime is 26721787. The next prime is 26721833. The reversal of 26721797 is 79712762.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24910081 + 1811716 = 4991^2 + 1346^2 .

It is a cyclic number.

It is not a de Polignac number, because 26721797 - 2¹⁰ = 26720773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26721727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13360898 + 13360899.

It is an arithmetic number, because the mean of its divisors is an integer number (13360899).

Almost surely, 2^26721797 is an apocalyptic number.

It is an amenable number.

26721797 is a deficient number, since it is larger than the sum of its proper divisors (1).

26721797 is an equidigital number, since it uses as much as digits as its factorization.

26721797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 74088, while the sum is 41.

The square root of 26721797 is about 5169.3130104493. The cubic root of 26721797 is about 298.9660591668.

The spelling of 26721797 in words is "twenty-six million, seven hundred twenty-one thousand, seven hundred ninety-seven".