26957989 has 6 divisors (see below), whose sum is σ = 27219570. Its totient is φ = 26698896.

The previous prime is 26957963. The next prime is 26958037. The reversal of 26957989 is 98975962.

It can be written as a sum of positive squares in 3 ways, for example, as 2455489 + 24502500 = 1567^2 + 4950^2 .

It is not a de Polignac number, because 26957989 - 2¹¹ = 26955941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26957929) 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 in 5 ways as a sum of consecutive naturals, for example, 10747 + ... + 13015.

It is an arithmetic number, because the mean of its divisors is an integer number (4536595).

Almost surely, 2^26957989 is an apocalyptic number.

It is an amenable number.

26957989 is a deficient number, since it is larger than the sum of its proper divisors (261581).

26957989 is an equidigital number, since it uses as much as digits as its factorization.

26957989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2487 (or 2378 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 55.

The square root of 26957989 is about 5192.1083386231. The cubic root of 26957989 is about 299.8443229332.

The spelling of 26957989 in words is "twenty-six million, nine hundred fifty-seven thousand, nine hundred eighty-nine".