1185881 has 4 divisors (see below), whose sum is σ = 1197072. Its totient is φ = 1174692.

The previous prime is 1185871. The next prime is 1185883. The reversal of 1185881 is 1885811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1185881 - 2⁶ = 1185817 is a prime.

It is a super-2 number, since 2×1185881² = 2812627492322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1185883) 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, 5435 + ... + 5648.

It is an arithmetic number, because the mean of its divisors is an integer number (299268).

2^1185881 is an apocalyptic number.

It is an amenable number.

1185881 is a deficient number, since it is larger than the sum of its proper divisors (11191).

1185881 is a wasteful number, since it uses less digits than its factorization.

1185881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11190.

The product of its digits is 2560, while the sum is 32.

The square root of 1185881 is about 1088.9816343722. The cubic root of 1185881 is about 105.8474428182.

The spelling of 1185881 in words is "one million, one hundred eighty-five thousand, eight hundred eighty-one".