11909845 has 4 divisors (see below), whose sum is σ = 14291820. Its totient is φ = 9527872.

The previous prime is 11909813. The next prime is 11909851. The reversal of 11909845 is 54890911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54890911 = 61 ⋅899851.

It can be written as a sum of positive squares in 2 ways, for example, as 8608356 + 3301489 = 2934^2 + 1817^2 .

It is a cyclic number.

It is not a de Polignac number, because 11909845 - 2⁵ = 11909813 is a prime.

It is a congruent number.

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, 1190980 + ... + 1190989.

It is an arithmetic number, because the mean of its divisors is an integer number (3572955).

Almost surely, 2^11909845 is an apocalyptic number.

It is an amenable number.

11909845 is a deficient number, since it is larger than the sum of its proper divisors (2381975).

11909845 is an equidigital number, since it uses as much as digits as its factorization.

11909845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2381974.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 11909845 is about 3451.0643285804. The cubic root of 11909845 is about 228.3680638145.

The spelling of 11909845 in words is "eleven million, nine hundred nine thousand, eight hundred forty-five".