11991372 has 36 divisors (see below), whose sum is σ = 29264760. Its totient is φ = 3821312.

The previous prime is 11991313. The next prime is 11991373. The reversal of 11991372 is 27319911.

It is not an unprimeable number, because it can be changed into a prime (11991373) 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, 5404 + ... + 7292.

It is an arithmetic number, because the mean of its divisors is an integer number (812910).

Almost surely, 2^11991372 is an apocalyptic number.

11991372 is a gapful number since it is divisible by the number (12) 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 11991372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14632380).

11991372 is an abundant number, since it is smaller than the sum of its proper divisors (17273388).

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

11991372 is a wasteful number, since it uses less digits than its factorization.

11991372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1942 (or 1917 counting only the distinct ones).

The product of its digits is 3402, while the sum is 33.

The square root of 11991372 is about 3462.8560466759. The cubic root of 11991372 is about 228.8879653855.

The spelling of 11991372 in words is "eleven million, nine hundred ninety-one thousand, three hundred seventy-two".