11909440 has 28 divisors (see below), whose sum is σ = 28360116. Its totient is φ = 4763648.

The previous prime is 11909431. The next prime is 11909441. The reversal of 11909440 is 4490911.

It can be written as a sum of positive squares in 2 ways, for example, as 4769856 + 7139584 = 2184^2 + 2672^2 .

It is a super-2 number, since 2×11909440² = 283669522227200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11909399 and 11909408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11909441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18289 + ... + 18928.

Almost surely, 2^11909440 is an apocalyptic number.

11909440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11909440 is an abundant number, since it is smaller than the sum of its proper divisors (16450676).

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

11909440 is an equidigital number, since it uses as much as digits as its factorization.

11909440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37234 (or 37224 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 11909440 is about 3451.0056505315. The cubic root of 11909440 is about 228.3654751966.

The spelling of 11909440 in words is "eleven million, nine hundred nine thousand, four hundred forty".