1090385 has 4 divisors (see below), whose sum is σ = 1308468. Its totient is φ = 872304.

The previous prime is 1090381. The next prime is 1090387. The reversal of 1090385 is 5830901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5830901 = 53 ⋅110017.

It can be written as a sum of positive squares in 2 ways, for example, as 692224 + 398161 = 832^2 + 631^2 .

It is a cyclic number.

It is not a de Polignac number, because 1090385 - 2² = 1090381 is a prime.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1090381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109034 + ... + 109043.

It is an arithmetic number, because the mean of its divisors is an integer number (327117).

2^1090385 is an apocalyptic number.

It is an amenable number.

1090385 is a deficient number, since it is larger than the sum of its proper divisors (218083).

1090385 is an equidigital number, since it uses as much as digits as its factorization.

1090385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218082.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 1090385 is about 1044.2150161724. The cubic root of 1090385 is about 102.9263620458.

The spelling of 1090385 in words is "one million, ninety thousand, three hundred eighty-five".