11439978 has 64 divisors (see below), whose sum is σ = 26611200. Its totient is φ = 3245760.

The previous prime is 11439977. The next prime is 11439979. The reversal of 11439978 is 87993411.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (11439977) and next prime (11439979).

It is not an unprimeable number, because it can be changed into a prime (11439977) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 82233 + ... + 82371.

It is an arithmetic number, because the mean of its divisors is an integer number (415800).

Almost surely, 2^11439978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11439978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13305600).

11439978 is an abundant number, since it is smaller than the sum of its proper divisors (15171222).

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

11439978 is a wasteful number, since it uses less digits than its factorization.

11439978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227.

The product of its digits is 54432, while the sum is 42.

The square root of 11439978 is about 3382.3036528378. The cubic root of 11439978 is about 225.3244898280.

The spelling of 11439978 in words is "eleven million, four hundred thirty-nine thousand, nine hundred seventy-eight".