11968509 has 16 divisors (see below), whose sum is σ = 18338432. Its totient is φ = 6801408.

The previous prime is 11968507. The next prime is 11968547. The reversal of 11968509 is 90586911.

It is not a de Polignac number, because 11968509 - 2¹ = 11968507 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11968507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2577 + ... + 5529.

It is an arithmetic number, because the mean of its divisors is an integer number (1146152).

Almost surely, 2^11968509 is an apocalyptic number.

It is an amenable number.

11968509 is a deficient number, since it is larger than the sum of its proper divisors (6369923).

11968509 is a wasteful number, since it uses less digits than its factorization.

11968509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3156.

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 11968509 is about 3459.5532948634. The cubic root of 11968509 is about 228.7424053139.

The spelling of 11968509 in words is "eleven million, nine hundred sixty-eight thousand, five hundred nine".