1187993 has 2 divisors, whose sum is σ = 1187994. Its totient is φ = 1187992.

The previous prime is 1187981. The next prime is 1187999. The reversal of 1187993 is 3997811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1149184 + 38809 = 1072^2 + 197^2 .

It is an emirp because it is prime and its reverse (3997811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1187993 - 2¹⁸ = 925849 is a prime.

It is a super-2 number, since 2×1187993² = 2822654736098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1187999) 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, 593996 + 593997.

It is an arithmetic number, because the mean of its divisors is an integer number (593997).

2^1187993 is an apocalyptic number.

It is an amenable number.

1187993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1187993 is an equidigital number, since it uses as much as digits as its factorization.

1187993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 38.

The square root of 1187993 is about 1089.9509163261. The cubic root of 1187993 is about 105.9102420422.

The spelling of 1187993 in words is "one million, one hundred eighty-seven thousand, nine hundred ninety-three".