26388989 has 16 divisors (see below), whose sum is σ = 29730240. Its totient is φ = 23218560.

The previous prime is 26388979. The next prime is 26388997. The reversal of 26388989 is 98988362.

It is a cyclic number.

It is not a de Polignac number, because 26388989 - 2²⁴ = 9611773 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26388989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26388919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47099 + ... + 47655.

It is an arithmetic number, because the mean of its divisors is an integer number (1858140).

Almost surely, 2^26388989 is an apocalyptic number.

It is an amenable number.

26388989 is a deficient number, since it is larger than the sum of its proper divisors (3341251).

26388989 is a wasteful number, since it uses less digits than its factorization.

26388989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700.

The product of its digits is 1492992, while the sum is 53.

The square root of 26388989 is about 5137.0214132316. The cubic root of 26388989 is about 297.7197077686.

The spelling of 26388989 in words is "twenty-six million, three hundred eighty-eight thousand, nine hundred eighty-nine".