11438778 has 32 divisors (see below), whose sum is σ = 25111296. Its totient is φ = 3451968.

The previous prime is 11438771. The next prime is 11438803. The reversal of 11438778 is 87783411.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (11438771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2751 + ... + 5517.

It is an arithmetic number, because the mean of its divisors is an integer number (784728).

Almost surely, 2^11438778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11438778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12555648).

11438778 is an abundant number, since it is smaller than the sum of its proper divisors (13672518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11438778 is a wasteful number, since it uses less digits than its factorization.

11438778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2838.

The product of its digits is 37632, while the sum is 39.

The square root of 11438778 is about 3382.1262542963. The cubic root of 11438778 is about 225.3166110586.

The spelling of 11438778 in words is "eleven million, four hundred thirty-eight thousand, seven hundred seventy-eight".