11907865 has 4 divisors (see below), whose sum is σ = 14289444. Its totient is φ = 9526288.

The previous prime is 11907829. The next prime is 11907869. The reversal of 11907865 is 56870911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56870911 = 89 ⋅638999.

It can be written as a sum of positive squares in 2 ways, for example, as 8696601 + 3211264 = 2949^2 + 1792^2 .

It is a cyclic number.

It is not a de Polignac number, because 11907865 - 2¹³ = 11899673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11907869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1190782 + ... + 1190791.

It is an arithmetic number, because the mean of its divisors is an integer number (3572361).

Almost surely, 2^11907865 is an apocalyptic number.

It is an amenable number.

11907865 is a deficient number, since it is larger than the sum of its proper divisors (2381579).

11907865 is an equidigital number, since it uses as much as digits as its factorization.

11907865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2381578.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 11907865 is about 3450.7774486339. Note that the first 3 decimals coincide. The cubic root of 11907865 is about 228.3554077912.

The spelling of 11907865 in words is "eleven million, nine hundred seven thousand, eight hundred sixty-five".