1891116 has 36 divisors (see below), whose sum is σ = 4828824. Its totient is φ = 624000.

The previous prime is 1891111. The next prime is 1891133. The reversal of 1891116 is 6111981.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1891116.

It is not an unprimeable number, because it can be changed into a prime (1891111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4516 + ... + 4916.

It is an arithmetic number, because the mean of its divisors is an integer number (134134).

2^1891116 is an apocalyptic number.

It is an amenable number.

1891116 is an abundant number, since it is smaller than the sum of its proper divisors (2937708).

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

1891116 is a wasteful number, since it uses less digits than its factorization.

1891116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542 (or 537 counting only the distinct ones).

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

The square root of 1891116 is about 1375.1785338639. The cubic root of 1891116 is about 123.6628894145.

The spelling of 1891116 in words is "one million, eight hundred ninety-one thousand, one hundred sixteen".