1128555 has 24 divisors (see below), whose sum is σ = 2021760. Its totient is φ = 581760.

The previous prime is 1128553. The next prime is 1128557. The reversal of 1128555 is 5558211.

It is an interprime number because it is at equal distance from previous prime (1128553) and next prime (1128557).

It is not a de Polignac number, because 1128555 - 2¹ = 1128553 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128553) 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, 991 + ... + 1799.

It is an arithmetic number, because the mean of its divisors is an integer number (84240).

2^1128555 is an apocalyptic number.

1128555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1128555 is a deficient number, since it is larger than the sum of its proper divisors (893205).

1128555 is a wasteful number, since it uses less digits than its factorization.

1128555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851 (or 848 counting only the distinct ones).

The product of its digits is 2000, while the sum is 27.

The square root of 1128555 is about 1062.3346930229. The cubic root of 1128555 is about 104.1136270423.

The spelling of 1128555 in words is "one million, one hundred twenty-eight thousand, five hundred fifty-five".