11978779 has 4 divisors (see below), whose sum is σ = 11995984. Its totient is φ = 11961576.

The previous prime is 11978737. The next prime is 11978819. The reversal of 11978779 is 97787911.

11978779 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11978779 - 2⁷ = 11978651 is a prime.

It is a super-2 number, since 2×11978779² = 286982292661682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11978579) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7512 + ... + 8965.

It is an arithmetic number, because the mean of its divisors is an integer number (2998996).

Almost surely, 2^11978779 is an apocalyptic number.

11978779 is a deficient number, since it is larger than the sum of its proper divisors (17205).

11978779 is an equidigital number, since it uses as much as digits as its factorization.

11978779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17204.

The product of its digits is 222264, while the sum is 49.

The square root of 11978779 is about 3461.0372722639. The cubic root of 11978779 is about 228.8078134303.

The spelling of 11978779 in words is "eleven million, nine hundred seventy-eight thousand, seven hundred seventy-nine".