1172987 has 4 divisors (see below), whose sum is σ = 1179720. Its totient is φ = 1166256.

The previous prime is 1172981. The next prime is 1172993. The reversal of 1172987 is 7892711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7892711 = 113 ⋅69847.

It is an interprime number because it is at equal distance from previous prime (1172981) and next prime (1172993).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1172987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1172981) 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, 3098 + ... + 3455.

It is an arithmetic number, because the mean of its divisors is an integer number (294930).

2^1172987 is an apocalyptic number.

1172987 is a deficient number, since it is larger than the sum of its proper divisors (6733).

1172987 is an equidigital number, since it uses as much as digits as its factorization.

1172987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6732.

The product of its digits is 7056, while the sum is 35.

The square root of 1172987 is about 1083.0452437456. The cubic root of 1172987 is about 105.4624200737.

The spelling of 1172987 in words is "one million, one hundred seventy-two thousand, nine hundred eighty-seven".