11978442 has 72 divisors (see below), whose sum is σ = 31370976. Its totient is φ = 3415608.

The previous prime is 11978429. The next prime is 11978443. The reversal of 11978442 is 24487911.

It is a junction number, because it is equal to n+sod(n) for n = 11978397 and 11978406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11978443) 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 35 ways as a sum of consecutive naturals, for example, 23563 + ... + 24065.

It is an arithmetic number, because the mean of its divisors is an integer number (435708).

Almost surely, 2^11978442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11978442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15685488).

11978442 is an abundant number, since it is smaller than the sum of its proper divisors (19392534).

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

11978442 is an equidigital number, since it uses as much as digits as its factorization.

11978442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534 (or 515 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 11978442 is about 3460.9885870947. The cubic root of 11978442 is about 228.8056677203.

The spelling of 11978442 in words is "eleven million, nine hundred seventy-eight thousand, four hundred forty-two".