11691378 has 20 divisors (see below), whose sum is σ = 26197710. Its totient is φ = 3897072.

The previous prime is 11691377. The next prime is 11691389. The reversal of 11691378 is 87319611.

11691378 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 11512449 + 178929 = 3393^2 + 423^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11691373) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 35923 + ... + 36246.

Almost surely, 2^11691378 is an apocalyptic number.

11691378 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11691378 is an abundant number, since it is smaller than the sum of its proper divisors (14506332).

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

11691378 is an equidigital number, since it uses as much as digits as its factorization.

11691378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72183 (or 72174 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 11691378 is about 3419.2657106461. The cubic root of 11691378 is about 226.9630892135.

The spelling of 11691378 in words is "eleven million, six hundred ninety-one thousand, three hundred seventy-eight".