11988691 has 12 divisors (see below), whose sum is σ = 14164200. Its totient is φ = 10058880.

The previous prime is 11988671. The next prime is 11988707. The reversal of 11988691 is 19688911.

It is a happy number.

It is not a de Polignac number, because 11988691 - 2¹¹ = 11986643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11988631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1366 + ... + 5083.

It is an arithmetic number, because the mean of its divisors is an integer number (1180350).

Almost surely, 2^11988691 is an apocalyptic number.

11988691 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11988691 is a deficient number, since it is larger than the sum of its proper divisors (2175509).

11988691 is a wasteful number, since it uses less digits than its factorization.

11988691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6486 (or 6473 counting only the distinct ones).

The product of its digits is 31104, while the sum is 43.

The square root of 11988691 is about 3462.4689168280. The cubic root of 11988691 is about 228.8709060540.

It can be divided in two parts, 1198 and 8691, that added together give a palindrome (9889).

The spelling of 11988691 in words is "eleven million, nine hundred eighty-eight thousand, six hundred ninety-one".