26261989 has 4 divisors (see below), whose sum is σ = 28282156. Its totient is φ = 24241824.

The previous prime is 26261987. The next prime is 26261999. The reversal of 26261989 is 98916262.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98916262 = 2 ⋅49458131.

It can be written as a sum of positive squares in 2 ways, for example, as 1361889 + 24900100 = 1167^2 + 4990^2 .

It is a cyclic number.

It is not a de Polignac number, because 26261989 - 2¹ = 26261987 is a prime.

It is a super-2 number, since 2×26261989² = 1379384132472242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26261981) 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 3 ways as a sum of consecutive naturals, for example, 1010064 + ... + 1010089.

It is an arithmetic number, because the mean of its divisors is an integer number (7070539).

Almost surely, 2^26261989 is an apocalyptic number.

It is an amenable number.

26261989 is a deficient number, since it is larger than the sum of its proper divisors (2020167).

26261989 is a wasteful number, since it uses less digits than its factorization.

26261989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2020166.

The product of its digits is 93312, while the sum is 43.

The square root of 26261989 is about 5124.6452560153. The cubic root of 26261989 is about 297.2413362630.

The spelling of 26261989 in words is "twenty-six million, two hundred sixty-one thousand, nine hundred eighty-nine".