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26989 = 137197
BaseRepresentation
bin110100101101101
31101000121
412211231
51330424
6324541
7141454
oct64555
941017
1026989
1119306
1213751
13c391
149b9b
157ee4
hex696d

26989 has 4 divisors (see below), whose sum is σ = 27324. Its totient is φ = 26656.

The previous prime is 26987. The next prime is 26993. The reversal of 26989 is 98962.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 98962 = 249481.

It can be written as a sum of positive squares in 2 ways, for example, as 22500 + 4489 = 150^2 + 67^2 .

It is a cyclic number.

It is not a de Polignac number, because 26989 - 21 = 26987 is a prime.

It is a super-2 number, since 2×269892 = 1456812242, which contains 22 as substring.

It is a Duffinian number.

26989 is an undulating number in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39 + ... + 235.

It is an arithmetic number, because the mean of its divisors is an integer number (6831).

226989 is an apocalyptic number.

It is an amenable number.

26989 is a deficient number, since it is larger than the sum of its proper divisors (335).

26989 is a wasteful number, since it uses less digits than its factorization.

26989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334.

The product of its digits is 7776, while the sum is 34.

The square root of 26989 is about 164.2832919076. The cubic root of 26989 is about 29.9959253725.

The spelling of 26989 in words is "twenty-six thousand, nine hundred eighty-nine".

Divisors: 1 137 197 26989