11387978 has 8 divisors (see below), whose sum is σ = 19522272. Its totient is φ = 4880556.

The previous prime is 11387953. The next prime is 11388017. The reversal of 11387978 is 87978311.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406700 + ... + 406727.

It is an arithmetic number, because the mean of its divisors is an integer number (2440284).

Almost surely, 2^11387978 is an apocalyptic number.

11387978 is a deficient number, since it is larger than the sum of its proper divisors (8134294).

11387978 is an equidigital number, since it uses as much as digits as its factorization.

11387978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 813436.

The product of its digits is 84672, while the sum is 44.

The square root of 11387978 is about 3374.6078290670. The cubic root of 11387978 is about 224.9825698432.

The spelling of 11387978 in words is "eleven million, three hundred eighty-seven thousand, nine hundred seventy-eight".