1091904 has 84 divisors (see below), whose sum is σ = 3243072. Its totient is φ = 323840.

The previous prime is 1091887. The next prime is 1091917. The reversal of 1091904 is 4091901.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23209 + ... + 23255.

It is an arithmetic number, because the mean of its divisors is an integer number (38608).

2^1091904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1091904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1621536).

1091904 is an abundant number, since it is smaller than the sum of its proper divisors (2151168).

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

1091904 is a wasteful number, since it uses less digits than its factorization.

1091904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84 (or 63 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 1091904 is about 1044.9421036593. The cubic root of 1091904 is about 102.9741349576.

The spelling of 1091904 in words is "one million, ninety-one thousand, nine hundred four".