11778013 has 8 divisors (see below), whose sum is σ = 12759768. Its totient is φ = 10807104.

The previous prime is 11778007. The next prime is 11778049. The reversal of 11778013 is 31087711.

It can be written as a sum of positive squares in 4 ways, for example, as 4149369 + 7628644 = 2037^2 + 2762^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 11778013 - 2¹⁷ = 11646941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11778083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 370 + ... + 4867.

It is an arithmetic number, because the mean of its divisors is an integer number (1594971).

Almost surely, 2^11778013 is an apocalyptic number.

11778013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

11778013 is a deficient number, since it is larger than the sum of its proper divisors (981755).

11778013 is a wasteful number, since it uses less digits than its factorization.

11778013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5423.

The product of its (nonzero) digits is 1176, while the sum is 28.

The square root of 11778013 is about 3431.9109836941. The cubic root of 11778013 is about 227.5223212008.

The spelling of 11778013 in words is "eleven million, seven hundred seventy-eight thousand, thirteen".