1091872 has 24 divisors (see below), whose sum is σ = 2173500. Its totient is φ = 539904.

The previous prime is 1091869. The next prime is 1091887. The reversal of 1091872 is 2781901.

It can be written as a sum of positive squares in 2 ways, for example, as 1089936 + 1936 = 1044^2 + 44^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1091872.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4654 + ... + 4882.

2^1091872 is an apocalyptic number.

It is an amenable number.

1091872 is a deficient number, since it is larger than the sum of its proper divisors (1081628).

1091872 is a wasteful number, since it uses less digits than its factorization.

1091872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388 (or 380 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 1091872 is about 1044.9267916940. The cubic root of 1091872 is about 102.9731290070.

The spelling of 1091872 in words is "one million, ninety-one thousand, eight hundred seventy-two".