11439865 has 4 divisors (see below), whose sum is σ = 13727844. Its totient is φ = 9151888.

The previous prime is 11439863. The next prime is 11439887. The reversal of 11439865 is 56893411.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1225449 + 10214416 = 1107^2 + 3196^2 .

It is a cyclic number.

It is not a de Polignac number, because 11439865 - 2¹ = 11439863 is a prime.

It is a super-2 number, since 2×11439865² = 261741022436450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11439863) 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, 1143982 + ... + 1143991.

It is an arithmetic number, because the mean of its divisors is an integer number (3431961).

Almost surely, 2^11439865 is an apocalyptic number.

It is an amenable number.

11439865 is a deficient number, since it is larger than the sum of its proper divisors (2287979).

11439865 is an equidigital number, since it uses as much as digits as its factorization.

11439865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2287978.

The product of its digits is 25920, while the sum is 37.

The square root of 11439865 is about 3382.2869482053. The cubic root of 11439865 is about 225.3237479340.

The spelling of 11439865 in words is "eleven million, four hundred thirty-nine thousand, eight hundred sixty-five".