11997928 has 16 divisors (see below), whose sum is σ = 22921380. Its totient is φ = 5885568.

The previous prime is 11997919. The next prime is 11997929. The reversal of 11997928 is 82979911.

It is a happy number.

11997928 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 11819844 + 178084 = 3438^2 + 422^2 .

It is not an unprimeable number, because it can be changed into a prime (11997929) 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, 13725 + ... + 14572.

Almost surely, 2^11997928 is an apocalyptic number.

It is an amenable number.

11997928 is a deficient number, since it is larger than the sum of its proper divisors (10923452).

11997928 is a wasteful number, since it uses less digits than its factorization.

11997928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28356 (or 28352 counting only the distinct ones).

The product of its digits is 81648, while the sum is 46.

The square root of 11997928 is about 3463.8025347875. The cubic root of 11997928 is about 228.9296708194.

The spelling of 11997928 in words is "eleven million, nine hundred ninety-seven thousand, nine hundred twenty-eight".