11871440 has 160 divisors (see below), whose sum is σ = 35354880. Its totient is φ = 3612672.

The previous prime is 11871437. The next prime is 11871451. The reversal of 11871440 is 4417811.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 276059 + ... + 276101.

It is an arithmetic number, because the mean of its divisors is an integer number (220968).

Almost surely, 2^11871440 is an apocalyptic number.

11871440 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 11871440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17677440).

11871440 is an abundant number, since it is smaller than the sum of its proper divisors (23483440).

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

11871440 is a wasteful number, since it uses less digits than its factorization.

11871440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109 (or 103 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 11871440 is about 3445.4956102134. The cubic root of 11871440 is about 228.1223309877.

The spelling of 11871440 in words is "eleven million, eight hundred seventy-one thousand, four hundred forty".