11161840 has 60 divisors (see below), whose sum is σ = 26920152. Its totient is φ = 4303360.

The previous prime is 11161807. The next prime is 11161847. The reversal of 11161840 is 4816111.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11161847) 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, 134439 + ... + 134521.

Almost surely, 2^11161840 is an apocalyptic number.

11161840 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 11161840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13460076).

11161840 is an abundant number, since it is smaller than the sum of its proper divisors (15758312).

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

11161840 is an equidigital number, since it uses as much as digits as its factorization.

11161840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178 (or 131 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 22.

The square root of 11161840 is about 3340.9340011440. The cubic root of 11161840 is about 223.4833970787.

Adding to 11161840 its reverse (4816111), we get a palindrome (15977951).

The spelling of 11161840 in words is "eleven million, one hundred sixty-one thousand, eight hundred forty".