11996509 has 8 divisors (see below), whose sum is σ = 14516928. Its totient is φ = 9677760.

The previous prime is 11996507. The next prime is 11996531. The reversal of 11996509 is 90569911.

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

It is not a de Polignac number, because 11996509 - 2¹ = 11996507 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 (11996507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50287 + ... + 50524.

It is an arithmetic number, because the mean of its divisors is an integer number (1814616).

Almost surely, 2^11996509 is an apocalyptic number.

It is an amenable number.

11996509 is a deficient number, since it is larger than the sum of its proper divisors (2520419).

11996509 is a wasteful number, since it uses less digits than its factorization.

11996509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100835.

The product of its (nonzero) digits is 21870, while the sum is 40.

The square root of 11996509 is about 3463.5976960380. The cubic root of 11996509 is about 228.9206452606.

The spelling of 11996509 in words is "eleven million, nine hundred ninety-six thousand, five hundred nine".