1181955 has 8 divisors (see below), whose sum is σ = 1891152. Its totient is φ = 630368.

The previous prime is 1181927. The next prime is 1181963. The reversal of 1181955 is 5591811.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1181955 - 2⁵ = 1181923 is a prime.

1181955 is a lucky number.

It is a zygodrome in base 14.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39384 + ... + 39413.

It is an arithmetic number, because the mean of its divisors is an integer number (236394).

2^1181955 is an apocalyptic number.

1181955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1181955 is a deficient number, since it is larger than the sum of its proper divisors (709197).

1181955 is an equidigital number, since it uses as much as digits as its factorization.

1181955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78805.

The product of its digits is 1800, while the sum is 30.

The square root of 1181955 is about 1087.1775383993. The cubic root of 1181955 is about 105.7305068329.

The spelling of 1181955 in words is "one million, one hundred eighty-one thousand, nine hundred fifty-five".