1091380 has 24 divisors (see below), whose sum is σ = 2311848. Its totient is φ = 432768.

The previous prime is 1091371. The next prime is 1091381. The reversal of 1091380 is 831901.

It can be written as a sum of positive squares in 4 ways, for example, as 219024 + 872356 = 468^2 + 934^2 .

It is a super-2 number, since 2×1091380² = 2382220608800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091381) 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, 3802 + ... + 4078.

It is an arithmetic number, because the mean of its divisors is an integer number (96327).

2^1091380 is an apocalyptic number.

1091380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1091380 is an abundant number, since it is smaller than the sum of its proper divisors (1220468).

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

1091380 is a wasteful number, since it uses less digits than its factorization.

1091380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483 (or 481 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 1091380 is about 1044.6913419762. The cubic root of 1091380 is about 102.9576600415.

The spelling of 1091380 in words is "one million, ninety-one thousand, three hundred eighty".