11990978 has 12 divisors (see below), whose sum is σ = 18630690. Its totient is φ = 5787936.

The previous prime is 11990971. The next prime is 11990987. The reversal of 11990978 is 87909911.

It can be written as a sum of positive squares in 3 ways, for example, as 10936249 + 1054729 = 3307^2 + 1027^2 .

It is not an unprimeable number, because it can be changed into a prime (11990971) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1883 + ... + 5246.

Almost surely, 2^11990978 is an apocalyptic number.

11990978 is a deficient number, since it is larger than the sum of its proper divisors (6639712).

11990978 is an equidigital number, since it uses as much as digits as its factorization.

11990978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7189 (or 7160 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 44.

The square root of 11990978 is about 3462.7991567517. The cubic root of 11990978 is about 228.8854585040.

The spelling of 11990978 in words is "eleven million, nine hundred ninety thousand, nine hundred seventy-eight".