26998721 has 2 divisors, whose sum is σ = 26998722. Its totient is φ = 26998720.

The previous prime is 26998717. The next prime is 26998729. The reversal of 26998721 is 12789962.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26419600 + 579121 = 5140^2 + 761^2 .

It is a cyclic number.

It is not a de Polignac number, because 26998721 - 2² = 26998717 is a prime.

It is not a weakly prime, because it can be changed into another prime (26998729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13499360 + 13499361.

It is an arithmetic number, because the mean of its divisors is an integer number (13499361).

Almost surely, 2^26998721 is an apocalyptic number.

It is an amenable number.

26998721 is a deficient number, since it is larger than the sum of its proper divisors (1).

26998721 is an equidigital number, since it uses as much as digits as its factorization.

26998721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 44.

The square root of 26998721 is about 5196.0293494167. The cubic root of 26998721 is about 299.9952628882.

The spelling of 26998721 in words is "twenty-six million, nine hundred ninety-eight thousand, seven hundred twenty-one".