11909005 has 8 divisors (see below), whose sum is σ = 14677272. Its totient is φ = 9269568.

The previous prime is 11908997. The next prime is 11909017. The reversal of 11909005 is 50090911.

It can be written as a sum of positive squares in 4 ways, for example, as 5076009 + 6832996 = 2253^2 + 2614^2 .

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 11909005 - 2³ = 11908997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32002 + ... + 32371.

It is an arithmetic number, because the mean of its divisors is an integer number (1834659).

Almost surely, 2^11909005 is an apocalyptic number.

It is an amenable number.

11909005 is a deficient number, since it is larger than the sum of its proper divisors (2768267).

11909005 is an equidigital number, since it uses as much as digits as its factorization.

11909005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64415.

The product of its (nonzero) digits is 405, while the sum is 25.

The square root of 11909005 is about 3450.9426248490. The cubic root of 11909005 is about 228.3626947638.

Adding to 11909005 its reverse (50090911), we get a palindrome (61999916).

The spelling of 11909005 in words is "eleven million, nine hundred nine thousand, five".