1091868 has 12 divisors (see below), whose sum is σ = 2547720. Its totient is φ = 363952.

The previous prime is 1091863. The next prime is 1091869. The reversal of 1091868 is 8681901.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45483 + ... + 45506.

It is an arithmetic number, because the mean of its divisors is an integer number (212310).

2^1091868 is an apocalyptic number.

It is an amenable number.

1091868 is an abundant number, since it is smaller than the sum of its proper divisors (1455852).

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

1091868 is a wasteful number, since it uses less digits than its factorization.

1091868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90996 (or 90994 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 1091868 is about 1044.9248776826. The cubic root of 1091868 is about 102.9730032618.

Adding to 1091868 its sum of digits (33), we get a palindrome (1091901).

The spelling of 1091868 in words is "one million, ninety-one thousand, eight hundred sixty-eight".