11978443 has 2 divisors, whose sum is σ = 11978444. Its totient is φ = 11978442.

The previous prime is 11978429. The next prime is 11978459. The reversal of 11978443 is 34487911.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11978443 - 2⁵ = 11978411 is a prime.

It is not a weakly prime, because it can be changed into another prime (11973443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5989221 + 5989222.

It is an arithmetic number, because the mean of its divisors is an integer number (5989222).

Almost surely, 2^11978443 is an apocalyptic number.

11978443 is a deficient number, since it is larger than the sum of its proper divisors (1).

11978443 is an equidigital number, since it uses as much as digits as its factorization.

11978443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 37.

The square root of 11978443 is about 3460.9887315621. The cubic root of 11978443 is about 228.8056740874.

It can be divided in two parts, 11978 and 443, that added together give a palindrome (12421).

The spelling of 11978443 in words is "eleven million, nine hundred seventy-eight thousand, four hundred forty-three".