11991268 has 24 divisors (see below), whose sum is σ = 21873600. Its totient is φ = 5744928.

The previous prime is 11991263. The next prime is 11991269. The reversal of 11991268 is 86219911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11991263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19063 + ... + 19681.

It is an arithmetic number, because the mean of its divisors is an integer number (911400).

Almost surely, 2^11991268 is an apocalyptic number.

It is an amenable number.

11991268 is a deficient number, since it is larger than the sum of its proper divisors (9882332).

11991268 is a wasteful number, since it uses less digits than its factorization.

11991268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819 (or 817 counting only the distinct ones).

The product of its digits is 7776, while the sum is 37.

The square root of 11991268 is about 3462.8410301370. The cubic root of 11991268 is about 228.8873036760.

The spelling of 11991268 in words is "eleven million, nine hundred ninety-one thousand, two hundred sixty-eight".