1187287 has 2 divisors, whose sum is σ = 1187288. Its totient is φ = 1187286.

The previous prime is 1187279. The next prime is 1187309. The reversal of 1187287 is 7827811.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1187287 - 2³ = 1187279 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1187227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 593643 + 593644.

It is an arithmetic number, because the mean of its divisors is an integer number (593644).

2^1187287 is an apocalyptic number.

1187287 is a deficient number, since it is larger than the sum of its proper divisors (1).

1187287 is an equidigital number, since it uses as much as digits as its factorization.

1187287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6272, while the sum is 34.

The square root of 1187287 is about 1089.6270003997. The cubic root of 1187287 is about 105.8892577862.

The spelling of 1187287 in words is "one million, one hundred eighty-seven thousand, two hundred eighty-seven".