11878809 has 8 divisors (see below), whose sum is σ = 15854592. Its totient is φ = 7911120.

The previous prime is 11878759. The next prime is 11878829. The reversal of 11878809 is 90887811.

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

It is not a de Polignac number, because 11878809 - 2⁹ = 11878297 is a prime.

It is a super-2 number, since 2×11878809² = 282212206516962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11878829) 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 7 ways as a sum of consecutive naturals, for example, 3799 + ... + 6179.

It is an arithmetic number, because the mean of its divisors is an integer number (1981824).

Almost surely, 2^11878809 is an apocalyptic number.

It is an amenable number.

11878809 is a deficient number, since it is larger than the sum of its proper divisors (3975783).

11878809 is a wasteful number, since it uses less digits than its factorization.

11878809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4047.

The product of its (nonzero) digits is 32256, while the sum is 42.

The square root of 11878809 is about 3446.5648115189. The cubic root of 11878809 is about 228.1695222791.

The spelling of 11878809 in words is "eleven million, eight hundred seventy-eight thousand, eight hundred nine".