11977778 has 8 divisors (see below), whose sum is σ = 17981568. Its totient is φ = 5983924.

The previous prime is 11977759. The next prime is 11977787. The reversal of 11977778 is 87777911.

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2675 + ... + 5577.

It is an arithmetic number, because the mean of its divisors is an integer number (2247696).

Almost surely, 2^11977778 is an apocalyptic number.

11977778 is a deficient number, since it is larger than the sum of its proper divisors (6003790).

11977778 is a wasteful number, since it uses less digits than its factorization.

11977778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4968.

The product of its digits is 172872, while the sum is 47.

The square root of 11977778 is about 3460.8926594161. The cubic root of 11977778 is about 228.8014398535.

The spelling of 11977778 in words is "eleven million, nine hundred seventy-seven thousand, seven hundred seventy-eight".