1189381 has 8 divisors (see below), whose sum is σ = 1274400. Its totient is φ = 1106640.

The previous prime is 1189361. The next prime is 1189387. The reversal of 1189381 is 1839811.

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 1189381 - 2¹⁵ = 1156613 is a prime.

It is a super-2 number, since 2×1189381² = 2829254326322, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1189387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 591 + ... + 1651.

It is an arithmetic number, because the mean of its divisors is an integer number (159300).

2^1189381 is an apocalyptic number.

It is an amenable number.

1189381 is a deficient number, since it is larger than the sum of its proper divisors (85019).

1189381 is a wasteful number, since it uses less digits than its factorization.

1189381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139.

The product of its digits is 1728, while the sum is 31.

The square root of 1189381 is about 1090.5874563739. The cubic root of 1189381 is about 105.9514729816.

The spelling of 1189381 in words is "one million, one hundred eighty-nine thousand, three hundred eighty-one".