11865917 has 4 divisors (see below), whose sum is σ = 13561056. Its totient is φ = 10170780.

The previous prime is 11865877. The next prime is 11865923. The reversal of 11865917 is 71956811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11865917 - 2⁶ = 11865853 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 (11865967) 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, 847559 + ... + 847572.

It is an arithmetic number, because the mean of its divisors is an integer number (3390264).

Almost surely, 2^11865917 is an apocalyptic number.

It is an amenable number.

11865917 is a deficient number, since it is larger than the sum of its proper divisors (1695139).

11865917 is an equidigital number, since it uses as much as digits as its factorization.

11865917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1695138.

The product of its digits is 15120, while the sum is 38.

The square root of 11865917 is about 3444.6940357599. The cubic root of 11865917 is about 228.0869487294.

The spelling of 11865917 in words is "eleven million, eight hundred sixty-five thousand, nine hundred seventeen".