1640560 has 20 divisors (see below), whose sum is σ = 3814488. Its totient is φ = 656192.

The previous prime is 1640557. The next prime is 1640599. The reversal of 1640560 is 650461.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×1640560² = 5382874227200, which contains 22 as substring.

It is a congruent 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, 10174 + ... + 10333.

2^1640560 is an apocalyptic number.

1640560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1640560 is an abundant number, since it is smaller than the sum of its proper divisors (2173928).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1640560 is a wasteful number, since it uses less digits than its factorization.

1640560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20520 (or 20514 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1640560 is about 1280.8434720917. The cubic root of 1640560 is about 117.9407918995.

Subtracting from 1640560 its reverse (650461), we obtain a palindrome (990099).

The spelling of 1640560 in words is "one million, six hundred forty thousand, five hundred sixty".