11991504 has 80 divisors (see below), whose sum is σ = 35890560. Its totient is φ = 3379200.

The previous prime is 11991481. The next prime is 11991517. The reversal of 11991504 is 40519911.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29704 + ... + 30104.

It is an arithmetic number, because the mean of its divisors is an integer number (448632).

Almost surely, 2^11991504 is an apocalyptic number.

11991504 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11991504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17945280).

11991504 is an abundant number, since it is smaller than the sum of its proper divisors (23899056).

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

11991504 is a wasteful number, since it uses less digits than its factorization.

11991504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508 (or 502 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 30.

The square root of 11991504 is about 3462.8751060354. The cubic root of 11991504 is about 228.8888052422. Note that the first 4 decimals are identical.

The spelling of 11991504 in words is "eleven million, nine hundred ninety-one thousand, five hundred four".