1181840 has 80 divisors (see below), whose sum is σ = 3214080. Its totient is φ = 399360.

The previous prime is 1181839. The next prime is 1181879. The reversal of 1181840 is 481811.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14921 + ... + 14999.

It is an arithmetic number, because the mean of its divisors is an integer number (40176).

2^1181840 is an apocalyptic number.

1181840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1181840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1607040).

1181840 is an abundant number, since it is smaller than the sum of its proper divisors (2032240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1181840 is a wasteful number, since it uses less digits than its factorization.

1181840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120 (or 114 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 23.

The square root of 1181840 is about 1087.1246478670. The cubic root of 1181840 is about 105.7270776548.

The spelling of 1181840 in words is "one million, one hundred eighty-one thousand, eight hundred forty".