11726989 has 4 divisors (see below), whose sum is σ = 11816640. Its totient is φ = 11637340.

The previous prime is 11726977. The next prime is 11726993. The reversal of 11726989 is 98962711.

11726989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11726989 - 2¹¹ = 11724941 is a prime.

It is a super-2 number, since 2×11726989² = 275044542012242, 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 (11726909) 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, 44629 + ... + 44890.

It is an arithmetic number, because the mean of its divisors is an integer number (2954160).

Almost surely, 2^11726989 is an apocalyptic number.

It is an amenable number.

11726989 is a deficient number, since it is larger than the sum of its proper divisors (89651).

11726989 is an equidigital number, since it uses as much as digits as its factorization.

11726989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89650.

The product of its digits is 54432, while the sum is 43.

The square root of 11726989 is about 3424.4691559423. The cubic root of 11726989 is about 227.1932927684.

The spelling of 11726989 in words is "eleven million, seven hundred twenty-six thousand, nine hundred eighty-nine".