1188381 has 8 divisors (see below), whose sum is σ = 1594080. Its totient is φ = 787472.

The previous prime is 1188377. The next prime is 1188389. The reversal of 1188381 is 1838811.

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 1188381 - 2² = 1188377 is a prime.

It is a super-3 number, since 3×1188381³ = 5034871066803331023, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a zygodrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1188389) 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, 570 + ... + 1643.

It is an arithmetic number, because the mean of its divisors is an integer number (199260).

2^1188381 is an apocalyptic number.

It is an amenable number.

1188381 is a deficient number, since it is larger than the sum of its proper divisors (405699).

1188381 is a wasteful number, since it uses less digits than its factorization.

1188381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2395.

The product of its digits is 1536, while the sum is 30.

The square root of 1188381 is about 1090.1288914619. The cubic root of 1188381 is about 105.9217709264.

The spelling of 1188381 in words is "one million, one hundred eighty-eight thousand, three hundred eighty-one".