1153987 has 4 divisors (see below), whose sum is σ = 1156176. Its totient is φ = 1151800.

The previous prime is 1153973. The next prime is 1154017. The reversal of 1153987 is 7893511.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1153987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1153967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237 + ... + 1537.

It is an arithmetic number, because the mean of its divisors is an integer number (289044).

2^1153987 is an apocalyptic number.

1153987 is a deficient number, since it is larger than the sum of its proper divisors (2189).

1153987 is an equidigital number, since it uses as much as digits as its factorization.

1153987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2188.

The product of its digits is 7560, while the sum is 34.

The square root of 1153987 is about 1074.2378693753. The cubic root of 1153987 is about 104.8898921347.

The spelling of 1153987 in words is "one million, one hundred fifty-three thousand, nine hundred eighty-seven".