1156005 has 16 divisors (see below), whose sum is σ = 2055360. Its totient is φ = 616464.

The previous prime is 1155997. The next prime is 1156009. The reversal of 1156005 is 5006511.

It is not a de Polignac number, because 1156005 - 2³ = 1155997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4147 + ... + 4416.

It is an arithmetic number, because the mean of its divisors is an integer number (128460).

2^1156005 is an apocalyptic number.

1156005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1156005 is a deficient number, since it is larger than the sum of its proper divisors (899355).

1156005 is an equidigital number, since it uses as much as digits as its factorization.

1156005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8577 (or 8571 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 1156005 is about 1075.1767296589. The cubic root of 1156005 is about 104.9509975428.

The spelling of 1156005 in words is "one million, one hundred fifty-six thousand, five".