11872009 has 8 divisors (see below), whose sum is σ = 12047400. Its totient is φ = 11698176.

The previous prime is 11871989. The next prime is 11872013. The reversal of 11872009 is 90027811.

It can be written as a sum of positive squares in 4 ways, for example, as 1452025 + 10419984 = 1205^2 + 3228^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11872009 - 2²¹ = 9774857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11872019) 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 7 ways as a sum of consecutive naturals, for example, 26217 + ... + 26665.

It is an arithmetic number, because the mean of its divisors is an integer number (1505925).

Almost surely, 2^11872009 is an apocalyptic number.

It is an amenable number.

11872009 is a deficient number, since it is larger than the sum of its proper divisors (175391).

11872009 is a wasteful number, since it uses less digits than its factorization.

11872009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 11872009 is about 3445.5781807993. The cubic root of 11872009 is about 228.1259755760.

It can be divided in two parts, 118 and 72009, that added together give a palindrome (72127).

The spelling of 11872009 in words is "eleven million, eight hundred seventy-two thousand, nine".