1181816 has 8 divisors (see below), whose sum is σ = 2215920. Its totient is φ = 590904.

The previous prime is 1181777. The next prime is 1181839. The reversal of 1181816 is 6181811.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73856 + ... + 73871.

It is an arithmetic number, because the mean of its divisors is an integer number (276990).

2^1181816 is an apocalyptic number.

It is an amenable number.

1181816 is a deficient number, since it is larger than the sum of its proper divisors (1034104).

1181816 is a wasteful number, since it uses less digits than its factorization.

1181816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147733 (or 147729 counting only the distinct ones).

The product of its digits is 384, while the sum is 26.

The square root of 1181816 is about 1087.1136095183. The cubic root of 1181816 is about 105.7263619722.

The spelling of 1181816 in words is "one million, one hundred eighty-one thousand, eight hundred sixteen".