1187867 has 2 divisors, whose sum is σ = 1187868. Its totient is φ = 1187866.

The previous prime is 1187863. The next prime is 1187873. The reversal of 1187867 is 7687811.

It is a weak prime.

It is an emirp because it is prime and its reverse (7687811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1187867 - 2² = 1187863 is a prime.

It is a super-2 number, since 2×1187867² = 2822056019378, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1187867.

It is not a weakly prime, because it can be changed into another prime (1187863) 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 as a sum of consecutive naturals, namely, 593933 + 593934.

It is an arithmetic number, because the mean of its divisors is an integer number (593934).

2^1187867 is an apocalyptic number.

1187867 is a deficient number, since it is larger than the sum of its proper divisors (1).

1187867 is an equidigital number, since it uses as much as digits as its factorization.

1187867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18816, while the sum is 38.

The square root of 1187867 is about 1089.8931140254. The cubic root of 1187867 is about 105.9064975863.

It can be divided in two parts, 11 and 87867, that added together give a palindrome (87878).

The spelling of 1187867 in words is "one million, one hundred eighty-seven thousand, eight hundred sixty-seven".