11861005 has 16 divisors (see below), whose sum is σ = 15410304. Its totient is φ = 8712000.

The previous prime is 11860993. The next prime is 11861011. The reversal of 11861005 is 50016811.

It is not a de Polignac number, because 11861005 - 2⁵ = 11860973 is a prime.

It is a super-2 number, since 2×11861005² = 281366879220050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 15952 + ... + 16678.

It is an arithmetic number, because the mean of its divisors is an integer number (963144).

Almost surely, 2^11861005 is an apocalyptic number.

It is an amenable number.

11861005 is a deficient number, since it is larger than the sum of its proper divisors (3549299).

11861005 is a wasteful number, since it uses less digits than its factorization.

11861005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 11861005 is about 3443.9809813644. The cubic root of 11861005 is about 228.0554715239.

Adding to 11861005 its reverse (50016811), we get a palindrome (61877816).

The spelling of 11861005 in words is "eleven million, eight hundred sixty-one thousand, five".