11822865 has 16 divisors (see below), whose sum is σ = 19569600. Its totient is φ = 6087872.

The previous prime is 11822857. The next prime is 11822911. The reversal of 11822865 is 56822811.

11822865 = T₁₂₈ + T₁₂₉ + ... + T₄₁₇.

It is a cyclic number.

It is not a de Polignac number, because 11822865 - 2³ = 11822857 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13155 + ... + 14024.

It is an arithmetic number, because the mean of its divisors is an integer number (1223100).

Almost surely, 2^11822865 is an apocalyptic number.

11822865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11822865 is a deficient number, since it is larger than the sum of its proper divisors (7746735).

11822865 is a wasteful number, since it uses less digits than its factorization.

11822865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27216.

The product of its digits is 7680, while the sum is 33.

The square root of 11822865 is about 3438.4393262060. The cubic root of 11822865 is about 227.8107655751.

The spelling of 11822865 in words is "eleven million, eight hundred twenty-two thousand, eight hundred sixty-five".