1147987 has 2 divisors, whose sum is σ = 1147988. Its totient is φ = 1147986.

The previous prime is 1147981. The next prime is 1147997. The reversal of 1147987 is 7897411.

It is a weak prime.

It is an emirp because it is prime and its reverse (7897411) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1147987 - 2¹⁹ = 623699 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1147981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 573993 + 573994.

It is an arithmetic number, because the mean of its divisors is an integer number (573994).

2^1147987 is an apocalyptic number.

1147987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1147987 is an equidigital number, since it uses as much as digits as its factorization.

1147987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 37.

The square root of 1147987 is about 1071.4415523023. The cubic root of 1147987 is about 104.7077892063.

The spelling of 1147987 in words is "one million, one hundred forty-seven thousand, nine hundred eighty-seven".