1091040 has 48 divisors (see below), whose sum is σ = 3438288. Its totient is φ = 290816.

The previous prime is 1091033. The next prime is 1091047. The reversal of 1091040 is 401901.

It is an interprime number because it is at equal distance from previous prime (1091033) and next prime (1091047).

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 657 + ... + 1616.

It is an arithmetic number, because the mean of its divisors is an integer number (71631).

2^1091040 is an apocalyptic number.

1091040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1091040 is an abundant number, since it is smaller than the sum of its proper divisors (2347248).

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

1091040 is a wasteful number, since it uses less digits than its factorization.

1091040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2291 (or 2283 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1091040 is about 1044.5286018104. The cubic root of 1091040 is about 102.9469673893.

Adding to 1091040 its reverse (401901), we get a palindrome (1492941).

The spelling of 1091040 in words is "one million, ninety-one thousand, forty".