11897789 has 4 divisors (see below), whose sum is σ = 11908956. Its totient is φ = 11886624.

The previous prime is 11897783. The next prime is 11897791. The reversal of 11897789 is 98779811.

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: 98779811 = 13 ⋅7598447.

It can be written as a sum of positive squares in 2 ways, for example, as 3545689 + 8352100 = 1883^2 + 2890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11897789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11897783) 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, 3794 + ... + 6179.

It is an arithmetic number, because the mean of its divisors is an integer number (2977239).

Almost surely, 2^11897789 is an apocalyptic number.

It is an amenable number.

11897789 is a deficient number, since it is larger than the sum of its proper divisors (11167).

11897789 is an equidigital number, since it uses as much as digits as its factorization.

11897789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11166.

The product of its digits is 254016, while the sum is 50.

The square root of 11897789 is about 3449.3171788051. The cubic root of 11897789 is about 228.2909809502.

The spelling of 11897789 in words is "eleven million, eight hundred ninety-seven thousand, seven hundred eighty-nine".