11881840 has 40 divisors (see below), whose sum is σ = 29082960. Its totient is φ = 4502016.

The previous prime is 11881829. The next prime is 11881843. The reversal of 11881840 is 4818811.

11881840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11881843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2389 + ... + 5428.

It is an arithmetic number, because the mean of its divisors is an integer number (727074).

Almost surely, 2^11881840 is an apocalyptic number.

11881840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11881840 is an abundant number, since it is smaller than the sum of its proper divisors (17201120).

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

11881840 is a wasteful number, since it uses less digits than its factorization.

11881840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7849 (or 7843 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 31.

The square root of 11881840 is about 3447.0044966608. The cubic root of 11881840 is about 228.1889272270.

Subtracting from 11881840 its sum of digits (31), we obtain a square (11881809 = 3447²).

It can be divided in two parts, 11881 and 840, that added together give a palindrome (12721).

The spelling of 11881840 in words is "eleven million, eight hundred eighty-one thousand, eight hundred forty".