11171840 has 48 divisors (see below), whose sum is σ = 26830440. Its totient is φ = 4464640.

The previous prime is 11171807. The next prime is 11171843. The reversal of 11171840 is 4817111.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11171843) 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, 9695 + ... + 10785.

Almost surely, 2^11171840 is an apocalyptic number.

11171840 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 11171840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13415220).

11171840 is an abundant number, since it is smaller than the sum of its proper divisors (15658600).

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

11171840 is an equidigital number, since it uses as much as digits as its factorization.

11171840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1118 (or 1098 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 23.

The square root of 11171840 is about 3342.4302535730. The cubic root of 11171840 is about 223.5501174671.

Adding to 11171840 its reverse (4817111), we get a palindrome (15988951).

The spelling of 11171840 in words is "eleven million, one hundred seventy-one thousand, eight hundred forty".