1117987 has 4 divisors (see below), whose sum is σ = 1204000. Its totient is φ = 1031976.

The previous prime is 1117973. The next prime is 1117993. The reversal of 1117987 is 7897111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7897111 = 1187 ⋅6653.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1117987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1117967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42987 + ... + 43012.

It is an arithmetic number, because the mean of its divisors is an integer number (301000).

2^1117987 is an apocalyptic number.

1117987 is a deficient number, since it is larger than the sum of its proper divisors (86013).

1117987 is an equidigital number, since it uses as much as digits as its factorization.

1117987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86012.

The product of its digits is 3528, while the sum is 34.

The square root of 1117987 is about 1057.3490435991. The cubic root of 1117987 is about 103.7876275189.

The spelling of 1117987 in words is "one million, one hundred seventeen thousand, nine hundred eighty-seven".