26443989 has 48 divisors (see below), whose sum is σ = 46597824. Its totient is φ = 14774400.

The previous prime is 26443973. The next prime is 26444017. The reversal of 26443989 is 98934462.

It is not a de Polignac number, because 26443989 - 2⁴ = 26443973 is a prime.

It is a super-3 number, since 3×26443989³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26443289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 34369 + ... + 35129.

It is an arithmetic number, because the mean of its divisors is an integer number (970788).

Almost surely, 2^26443989 is an apocalyptic number.

It is an amenable number.

26443989 is a deficient number, since it is larger than the sum of its proper divisors (20153835).

26443989 is a wasteful number, since it uses less digits than its factorization.

26443989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800 (or 788 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 26443989 is about 5142.3719235388. The cubic root of 26443989 is about 297.9264003036.

It can be divided in two parts, 264 and 43989, that added together give a triangular number (44253 = T₂₉₇).

The spelling of 26443989 in words is "twenty-six million, four hundred forty-three thousand, nine hundred eighty-nine".