1808385 has 16 divisors (see below), whose sum is σ = 2987520. Its totient is φ = 933120.

The previous prime is 1808377. The next prime is 1808399. The reversal of 1808385 is 5838081.

It is not a de Polignac number, because 1808385 - 2³ = 1808377 is a prime.

It is a plaindrome in base 9.

It is a zygodrome in base 9.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1480 + ... + 2409.

It is an arithmetic number, because the mean of its divisors is an integer number (186720).

It is a Proth number, since it is equal to 883 ⋅ 2¹¹ + 1 and 883 < 2¹¹.

2^1808385 is an apocalyptic number.

1808385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1808385 is a deficient number, since it is larger than the sum of its proper divisors (1179135).

1808385 is a wasteful number, since it uses less digits than its factorization.

1808385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3928.

The product of its (nonzero) digits is 7680, while the sum is 33.

The square root of 1808385 is about 1344.7620607379. The cubic root of 1808385 is about 121.8326335319.

The spelling of 1808385 in words is "one million, eight hundred eight thousand, three hundred eighty-five".