11001978 has 24 divisors (see below), whose sum is σ = 25671828. Its totient is φ = 3385152.

The previous prime is 11001973. The next prime is 11001983. The reversal of 11001978 is 87910011.

It is an interprime number because it is at equal distance from previous prime (11001973) and next prime (11001983).

It can be written as a sum of positive squares in 2 ways, for example, as 10870209 + 131769 = 3297^2 + 363^2 .

It is not an unprimeable number, because it can be changed into a prime (11001973) 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 11 ways as a sum of consecutive naturals, for example, 23275 + ... + 23742.

Almost surely, 2^11001978 is an apocalyptic number.

11001978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11001978 is an abundant number, since it is smaller than the sum of its proper divisors (14669850).

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

11001978 is a wasteful number, since it uses less digits than its factorization.

11001978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47038 (or 47035 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 27.

The square root of 11001978 is about 3316.9229716712. The cubic root of 11001978 is about 222.4113386599.

Adding to 11001978 its reverse (87910011), we get a palindrome (98911989).

The spelling of 11001978 in words is "eleven million, one thousand, nine hundred seventy-eight".