11865887 has 4 divisors (see below), whose sum is σ = 12944616. Its totient is φ = 10787160.

The previous prime is 11865877. The next prime is 11865923. The reversal of 11865887 is 78856811.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11865887 - 2⁴ = 11865871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11865877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 539348 + ... + 539369.

It is an arithmetic number, because the mean of its divisors is an integer number (3236154).

Almost surely, 2^11865887 is an apocalyptic number.

11865887 is a deficient number, since it is larger than the sum of its proper divisors (1078729).

11865887 is a wasteful number, since it uses less digits than its factorization.

11865887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078728.

The product of its digits is 107520, while the sum is 44.

The square root of 11865887 is about 3444.6896812340. The cubic root of 11865887 is about 228.0867565090.

The spelling of 11865887 in words is "eleven million, eight hundred sixty-five thousand, eight hundred eighty-seven".