11919840 has 96 divisors (see below), whose sum is σ = 39553920. Its totient is φ = 3009024.

The previous prime is 11919799. The next prime is 11919847. The reversal of 11919840 is 4891911.

11919840 is digitally balanced in base 2 and base 4, because in such bases 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 (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11919847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8467 + ... + 9773.

It is an arithmetic number, because the mean of its divisors is an integer number (412020).

Almost surely, 2^11919840 is an apocalyptic number.

11919840 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 11919840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19776960).

11919840 is an abundant number, since it is smaller than the sum of its proper divisors (27634080).

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

11919840 is a wasteful number, since it uses less digits than its factorization.

11919840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344 (or 1336 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 33.

The square root of 11919840 is about 3452.5121288708. The cubic root of 11919840 is about 228.4319297611.

The spelling of 11919840 in words is "eleven million, nine hundred nineteen thousand, eight hundred forty".