11981375 has 16 divisors (see below), whose sum is σ = 17090112. Its totient is φ = 8215200.

The previous prime is 11981363. The next prime is 11981393. The reversal of 11981375 is 57318911.

It is not a de Polignac number, because 11981375 - 2²⁰ = 10932799 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5972 + ... + 7721.

It is an arithmetic number, because the mean of its divisors is an integer number (1068132).

Almost surely, 2^11981375 is an apocalyptic number.

11981375 is a deficient number, since it is larger than the sum of its proper divisors (5108737).

11981375 is an equidigital number, since it uses as much as digits as its factorization.

11981375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13715 (or 13705 counting only the distinct ones).

The product of its digits is 7560, while the sum is 35.

The square root of 11981375 is about 3461.4122840251. The cubic root of 11981375 is about 228.8243410519.

The spelling of 11981375 in words is "eleven million, nine hundred eighty-one thousand, three hundred seventy-five".