26947639 has 2 divisors, whose sum is σ = 26947640. Its totient is φ = 26947638.

The previous prime is 26947607. The next prime is 26947663. The reversal of 26947639 is 93674962.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26947639 - 2⁵ = 26947607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26947139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13473819 + 13473820.

It is an arithmetic number, because the mean of its divisors is an integer number (13473820).

Almost surely, 2^26947639 is an apocalyptic number.

26947639 is a deficient number, since it is larger than the sum of its proper divisors (1).

26947639 is an equidigital number, since it uses as much as digits as its factorization.

26947639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 46.

The square root of 26947639 is about 5191.1115380042. Note that the first 3 decimals coincide. The cubic root of 26947639 is about 299.8059448728.

The spelling of 26947639 in words is "twenty-six million, nine hundred forty-seven thousand, six hundred thirty-nine".