11977809 has 32 divisors (see below), whose sum is σ = 18247680. Its totient is φ = 6941952.

The previous prime is 11977807. The next prime is 11977817. The reversal of 11977809 is 90877911.

It is a happy number.

It is not a de Polignac number, because 11977809 - 2¹ = 11977807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11977807) 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 31 ways as a sum of consecutive naturals, for example, 45412 + ... + 45674.

It is an arithmetic number, because the mean of its divisors is an integer number (570240).

Almost surely, 2^11977809 is an apocalyptic number.

11977809 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

11977809 is a deficient number, since it is larger than the sum of its proper divisors (6269871).

11977809 is a wasteful number, since it uses less digits than its factorization.

11977809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349.

The product of its (nonzero) digits is 31752, while the sum is 42.

The square root of 11977809 is about 3460.8971380265. The cubic root of 11977809 is about 228.8016372423.

The spelling of 11977809 in words is "eleven million, nine hundred seventy-seven thousand, eight hundred nine".