1181916 has 18 divisors (see below), whose sum is σ = 2987712. Its totient is φ = 393960.

The previous prime is 1181911. The next prime is 1181923. The reversal of 1181916 is 6191811.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1181916.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1181911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16380 + ... + 16451.

It is an arithmetic number, because the mean of its divisors is an integer number (165984).

2^1181916 is an apocalyptic number.

It is an amenable number.

1181916 is an abundant number, since it is smaller than the sum of its proper divisors (1805796).

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

1181916 is a wasteful number, since it uses less digits than its factorization.

1181916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32841 (or 32836 counting only the distinct ones).

The product of its digits is 432, while the sum is 27.

The square root of 1181916 is about 1087.1596018985. The cubic root of 1181916 is about 105.7293439192.

The spelling of 1181916 in words is "one million, one hundred eighty-one thousand, nine hundred sixteen".