11911440 has 80 divisors (see below), whose sum is σ = 38140416. Its totient is φ = 3072000.

The previous prime is 11911439. The next prime is 11911453. The reversal of 11911440 is 4411911.

It is a tau number, because it is divible by the number of its divisors (80).

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, 6640 + ... + 8240.

Almost surely, 2^11911440 is an apocalyptic number.

11911440 is a gapful number since it is divisible by the number (10) 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 11911440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19070208).

11911440 is an abundant number, since it is smaller than the sum of its proper divisors (26228976).

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

11911440 is a wasteful number, since it uses less digits than its factorization.

11911440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1648 (or 1642 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 11911440 is about 3451.2954089733. The cubic root of 11911440 is about 228.3782579243.

The spelling of 11911440 in words is "eleven million, nine hundred eleven thousand, four hundred forty".