1089987 has 4 divisors (see below), whose sum is σ = 1453320. Its totient is φ = 726656.

The previous prime is 1089967. The next prime is 1090003. The reversal of 1089987 is 7899801.

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

It is a cyclic number.

It is not a de Polignac number, because 1089987 - 2¹² = 1085891 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1089917) 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, 181662 + ... + 181667.

It is an arithmetic number, because the mean of its divisors is an integer number (363330).

2^1089987 is an apocalyptic number.

1089987 is a deficient number, since it is larger than the sum of its proper divisors (363333).

1089987 is an equidigital number, since it uses as much as digits as its factorization.

1089987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363332.

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 1089987 is about 1044.0244250016. The cubic root of 1089987 is about 102.9138375163.

The spelling of 1089987 in words is "one million, eighty-nine thousand, nine hundred eighty-seven".