11978771 has 8 divisors (see below), whose sum is σ = 13795584. Its totient is φ = 10188360.

The previous prime is 11978737. The next prime is 11978819. The reversal of 11978771 is 17787911.

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

It is not a de Polignac number, because 11978771 - 2¹⁰ = 11977747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11978731) 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, 5615 + ... + 7448.

It is an arithmetic number, because the mean of its divisors is an integer number (1724448).

Almost surely, 2^11978771 is an apocalyptic number.

11978771 is a deficient number, since it is larger than the sum of its proper divisors (1816813).

11978771 is a wasteful number, since it uses less digits than its factorization.

11978771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13201.

The product of its digits is 24696, while the sum is 41.

The square root of 11978771 is about 3461.0361165408. The cubic root of 11978771 is about 228.8077624940.

The spelling of 11978771 in words is "eleven million, nine hundred seventy-eight thousand, seven hundred seventy-one".