11815965 has 24 divisors (see below), whose sum is σ = 23407488. Its totient is φ = 5401440.

The previous prime is 11815961. The next prime is 11816009. The reversal of 11815965 is 56951811.

It is not a de Polignac number, because 11815965 - 2² = 11815961 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11815961) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 18441 + ... + 19070.

It is an arithmetic number, because the mean of its divisors is an integer number (975312).

Almost surely, 2^11815965 is an apocalyptic number.

11815965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11815965 is a deficient number, since it is larger than the sum of its proper divisors (11591523).

11815965 is a wasteful number, since it uses less digits than its factorization.

11815965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37529 (or 37526 counting only the distinct ones).

The product of its digits is 10800, while the sum is 36.

The square root of 11815965 is about 3437.4358175826. The cubic root of 11815965 is about 227.7664390328.

The spelling of 11815965 in words is "eleven million, eight hundred fifteen thousand, nine hundred sixty-five".