1091740 has 72 divisors (see below), whose sum is σ = 2766960. Its totient is φ = 359424.

The previous prime is 1091737. The next prime is 1091749. The reversal of 1091740 is 471901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091749) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57451 + ... + 57469.

It is an arithmetic number, because the mean of its divisors is an integer number (38430).

2^1091740 is an apocalyptic number.

1091740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1091740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1383480).

1091740 is an abundant number, since it is smaller than the sum of its proper divisors (1675220).

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

1091740 is a wasteful number, since it uses less digits than its factorization.

1091740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71 (or 56 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 1091740 is about 1044.8636274653. The cubic root of 1091740 is about 102.9689792529.

It can be divided in two parts, 109 and 1740, that added together give a square (1849 = 43²).

The spelling of 1091740 in words is "one million, ninety-one thousand, seven hundred forty".