1091385 has 24 divisors (see below), whose sum is σ = 1921920. Its totient is φ = 572832.

The previous prime is 1091381. The next prime is 1091393. The reversal of 1091385 is 5831901.

It is not a de Polignac number, because 1091385 - 2² = 1091381 is a prime.

It is a super-2 number, since 2×1091385² = 2382242436450, which contains 22 as substring.

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 23 ways as a sum of consecutive naturals, for example, 3402 + ... + 3708.

It is an arithmetic number, because the mean of its divisors is an integer number (80080).

2^1091385 is an apocalyptic number.

1091385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1091385 is a deficient number, since it is larger than the sum of its proper divisors (830535).

1091385 is a wasteful number, since it uses less digits than its factorization.

1091385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397 (or 394 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 1091385 is about 1044.6937350248. The cubic root of 1091385 is about 102.9578172698.

The spelling of 1091385 in words is "one million, ninety-one thousand, three hundred eighty-five".