11865729 has 4 divisors (see below), whose sum is σ = 15820976. Its totient is φ = 7910484.

The previous prime is 11865713. The next prime is 11865739. The reversal of 11865729 is 92756811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 11865729 - 2⁴ = 11865713 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11865739) 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, 1977619 + ... + 1977624.

It is an arithmetic number, because the mean of its divisors is an integer number (3955244).

Almost surely, 2^11865729 is an apocalyptic number.

It is an amenable number.

11865729 is a deficient number, since it is larger than the sum of its proper divisors (3955247).

11865729 is an equidigital number, since it uses as much as digits as its factorization.

11865729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3955246.

The product of its digits is 30240, while the sum is 39.

The square root of 11865729 is about 3444.6667473066. Note that the first 3 decimals coincide. The cubic root of 11865729 is about 228.0857441428.

The spelling of 11865729 in words is "eleven million, eight hundred sixty-five thousand, seven hundred twenty-nine".