1186681 has 4 divisors (see below), whose sum is σ = 1188864. Its totient is φ = 1184500.

The previous prime is 1186673. The next prime is 1186693. The reversal of 1186681 is 1866811.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1866811 = 389 ⋅4799.

It is a cyclic number.

It is not a de Polignac number, because 1186681 - 2³ = 1186673 is a prime.

It is a super-2 number, since 2×1186681² = 2816423591522, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1186621) by changing a digit.

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, 456 + ... + 1606.

It is an arithmetic number, because the mean of its divisors is an integer number (297216).

2^1186681 is an apocalyptic number.

It is an amenable number.

1186681 is a deficient number, since it is larger than the sum of its proper divisors (2183).

1186681 is a wasteful number, since it uses less digits than its factorization.

1186681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2182.

The product of its digits is 2304, while the sum is 31.

The square root of 1186681 is about 1089.3488880978. The cubic root of 1186681 is about 105.8712391688.

The spelling of 1186681 in words is "one million, one hundred eighty-six thousand, six hundred eighty-one".