11872909 has 4 divisors (see below), whose sum is σ = 11888604. Its totient is φ = 11857216.

The previous prime is 11872879. The next prime is 11872951. The reversal of 11872909 is 90927811.

11872909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90927811 = 13 ⋅6994447.

It can be written as a sum of positive squares in 2 ways, for example, as 8820900 + 3052009 = 2970^2 + 1747^2 .

It is a cyclic number.

It is not a de Polignac number, because 11872909 - 2⁵ = 11872877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11879909) 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, 6652 + ... + 8245.

It is an arithmetic number, because the mean of its divisors is an integer number (2972151).

Almost surely, 2^11872909 is an apocalyptic number.

It is an amenable number.

11872909 is a deficient number, since it is larger than the sum of its proper divisors (15695).

11872909 is an equidigital number, since it uses as much as digits as its factorization.

11872909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15694.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 11872909 is about 3445.7087804979. The cubic root of 11872909 is about 228.1317400648.

It can be divided in two parts, 1187 and 2909, that added together give a 12-th power (4096 = 2¹²).

The spelling of 11872909 in words is "eleven million, eight hundred seventy-two thousand, nine hundred nine".