11911840 has 24 divisors (see below), whose sum is σ = 28142100. Its totient is φ = 4764672.

The previous prime is 11911829. The next prime is 11911859. The reversal of 11911840 is 4811911.

It can be written as a sum of positive squares in 2 ways, for example, as 10575504 + 1336336 = 3252^2 + 1156^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37065 + ... + 37384.

Almost surely, 2^11911840 is an apocalyptic number.

11911840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11911840 is an abundant number, since it is smaller than the sum of its proper divisors (16230260).

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

11911840 is an equidigital number, since it uses as much as digits as its factorization.

11911840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74464 (or 74456 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 25.

The square root of 11911840 is about 3451.3533577424. The cubic root of 11911840 is about 228.3808142981.

The spelling of 11911840 in words is "eleven million, nine hundred eleven thousand, eight hundred forty".