11213865 has 48 divisors (see below), whose sum is σ = 21687120. Its totient is φ = 5322240.

The previous prime is 11213843. The next prime is 11213957. The reversal of 11213865 is 56831211.

It can be written as a sum of positive squares in 8 ways, for example, as 104976 + 11108889 = 324^2 + 3333^2 .

It is not a de Polignac number, because 11213865 - 2⁵ = 11213833 is a prime.

It is a congruent 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 47 ways as a sum of consecutive naturals, for example, 16635 + ... + 17295.

It is an arithmetic number, because the mean of its divisors is an integer number (451815).

Almost surely, 2^11213865 is an apocalyptic number.

11213865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11213865 is a deficient number, since it is larger than the sum of its proper divisors (10473255).

11213865 is a wasteful number, since it uses less digits than its factorization.

11213865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714 (or 711 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 11213865 is about 3348.7109460209. The cubic root of 11213865 is about 223.8300754766.

The spelling of 11213865 in words is "eleven million, two hundred thirteen thousand, eight hundred sixty-five".