11971387 has 8 divisors (see below), whose sum is σ = 12942800. Its totient is φ = 11034144.

The previous prime is 11971373. The next prime is 11971397. The reversal of 11971387 is 78317911.

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

It is a cyclic number.

It is not a de Polignac number, because 11971387 - 2⁷ = 11971259 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is not an unprimeable number, because it can be changed into a prime (11971327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7812 + ... + 9217.

It is an arithmetic number, because the mean of its divisors is an integer number (1617850).

Almost surely, 2^11971387 is an apocalyptic number.

11971387 is a deficient number, since it is larger than the sum of its proper divisors (971413).

11971387 is a wasteful number, since it uses less digits than its factorization.

11971387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17085.

The product of its digits is 10584, while the sum is 37.

The square root of 11971387 is about 3459.9692195163. The cubic root of 11971387 is about 228.7607386440.

The spelling of 11971387 in words is "eleven million, nine hundred seventy-one thousand, three hundred eighty-seven".