1840385 has 4 divisors (see below), whose sum is σ = 2208468. Its totient is φ = 1472304.

The previous prime is 1840351. The next prime is 1840393. The reversal of 1840385 is 5830481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5830481 = 571 ⋅10211.

It can be written as a sum of positive squares in 2 ways, for example, as 1399489 + 440896 = 1183^2 + 664^2 .

It is a cyclic number.

It is not a de Polignac number, because 1840385 - 2¹⁰ = 1839361 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184034 + ... + 184043.

It is an arithmetic number, because the mean of its divisors is an integer number (552117).

2^1840385 is an apocalyptic number.

It is an amenable number.

1840385 is a deficient number, since it is larger than the sum of its proper divisors (368083).

1840385 is an equidigital number, since it uses as much as digits as its factorization.

1840385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368082.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 1840385 is about 1356.6079020852. The cubic root of 1840385 is about 122.5470595259.

The spelling of 1840385 in words is "one million, eight hundred forty thousand, three hundred eighty-five".