11987289 has 6 divisors (see below), whose sum is σ = 17314986. Its totient is φ = 7991520.

The previous prime is 11987279. The next prime is 11987291. The reversal of 11987289 is 98278911.

It can be written as a sum of positive squares in only one way, i.e., 6734025 + 5253264 = 2595^2 + 2292^2 .

It is not a de Polignac number, because 11987289 - 2⁴ = 11987273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11987219) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 665952 + ... + 665969.

It is an arithmetic number, because the mean of its divisors is an integer number (2885831).

Almost surely, 2^11987289 is an apocalyptic number.

It is an amenable number.

11987289 is a deficient number, since it is larger than the sum of its proper divisors (5327697).

11987289 is a wasteful number, since it uses less digits than its factorization.

11987289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331927 (or 1331924 counting only the distinct ones).

The product of its digits is 72576, while the sum is 45.

The square root of 11987289 is about 3462.2664542175. The cubic root of 11987289 is about 228.8619840480.

The spelling of 11987289 in words is "eleven million, nine hundred eighty-seven thousand, two hundred eighty-nine".