1128987 has 24 divisors (see below), whose sum is σ = 1774656. Its totient is φ = 688896.

The previous prime is 1128979. The next prime is 1128997. The reversal of 1128987 is 7898211.

It is not a de Polignac number, because 1128987 - 2³ = 1128979 is a prime.

It is a super-2 number, since 2×1128987² = 2549223292338, which contains 22 as substring.

Its product of digits (8064) is a multiple of the sum of its prime divisors (224).

It is not an unprimeable number, because it can be changed into a prime (1128917) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7113 + ... + 7269.

It is an arithmetic number, because the mean of its divisors is an integer number (73944).

2^1128987 is an apocalyptic number.

1128987 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1128987 is a deficient number, since it is larger than the sum of its proper divisors (645669).

1128987 is a wasteful number, since it uses less digits than its factorization.

1128987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227 (or 224 counting only the distinct ones).

The product of its digits is 8064, while the sum is 36.

The square root of 1128987 is about 1062.5379993205. The cubic root of 1128987 is about 104.1269099126.

The spelling of 1128987 in words is "one million, one hundred twenty-eight thousand, nine hundred eighty-seven".