11927978 has 4 divisors (see below), whose sum is σ = 17891970. Its totient is φ = 5963988.

The previous prime is 11927977. The next prime is 11927983. The reversal of 11927978 is 87972911.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6086089 + 5841889 = 2467^2 + 2417^2 .

It is not an unprimeable number, because it can be changed into a prime (11927977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2981993 + ... + 2981996.

Almost surely, 2^11927978 is an apocalyptic number.

11927978 is a deficient number, since it is larger than the sum of its proper divisors (5963992).

11927978 is an equidigital number, since it uses as much as digits as its factorization.

11927978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5963991.

The product of its digits is 63504, while the sum is 44.

The square root of 11927978 is about 3453.6904898963. The cubic root of 11927978 is about 228.4839035054.

The spelling of 11927978 in words is "eleven million, nine hundred twenty-seven thousand, nine hundred seventy-eight".