1640085 has 16 divisors (see below), whose sum is σ = 2674944. Its totient is φ = 857792.

The previous prime is 1640083. The next prime is 1640131. The reversal of 1640085 is 5800461.

It is a cyclic number.

It is not a de Polignac number, because 1640085 - 2¹ = 1640083 is a prime.

1640085 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640083) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 237 + ... + 1826.

It is an arithmetic number, because the mean of its divisors is an integer number (167184).

2^1640085 is an apocalyptic number.

1640085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1640085 is a deficient number, since it is larger than the sum of its proper divisors (1034859).

1640085 is a wasteful number, since it uses less digits than its factorization.

1640085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2124.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 1640085 is about 1280.6580339810. The cubic root of 1640085 is about 117.9294081273.

The spelling of 1640085 in words is "one million, six hundred forty thousand, eighty-five".