11991948 has 12 divisors (see below), whose sum is σ = 27981240. Its totient is φ = 3997312.

The previous prime is 11991943. The next prime is 11991977. The reversal of 11991948 is 84919911.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (11991943) 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, 499653 + ... + 499676.

It is an arithmetic number, because the mean of its divisors is an integer number (2331770).

Almost surely, 2^11991948 is an apocalyptic number.

It is an amenable number.

11991948 is an abundant number, since it is smaller than the sum of its proper divisors (15989292).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11991948 is a wasteful number, since it uses less digits than its factorization.

11991948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999336 (or 999334 counting only the distinct ones).

The product of its digits is 23328, while the sum is 42.

The square root of 11991948 is about 3462.9392140204. The cubic root of 11991948 is about 228.8916301693.

The spelling of 11991948 in words is "eleven million, nine hundred ninety-one thousand, nine hundred forty-eight".