11911920 has 40 divisors (see below), whose sum is σ = 36927696. Its totient is φ = 3176448.

The previous prime is 11911919. The next prime is 11911927. The reversal of 11911920 is 2911911.

11911920 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 super-3 number, since 3×11911920³ (a number of 22 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11911927) 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, 24577 + ... + 25056.

Almost surely, 2^11911920 is an apocalyptic number.

11911920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11911920 is an abundant number, since it is smaller than the sum of its proper divisors (25015776).

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

11911920 is a wasteful number, since it uses less digits than its factorization.

11911920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49649 (or 49643 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 24.

The square root of 11911920 is about 3451.3649473795. The cubic root of 11911920 is about 228.3813255660.

Subtracting from 11911920 its reverse (2911911), we obtain a palindrome (9000009).

The spelling of 11911920 in words is "eleven million, nine hundred eleven thousand, nine hundred twenty".