1646560 has 48 divisors (see below), whose sum is σ = 4000752. Its totient is φ = 640000.

The previous prime is 1646543. The next prime is 1646563. The reversal of 1646560 is 656461.

It is a super-2 number, since 2×1646560² = 5422319667200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1646563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6435 + ... + 6685.

It is an arithmetic number, because the mean of its divisors is an integer number (83349).

2^1646560 is an apocalyptic number.

1646560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1646560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2000376).

1646560 is an abundant number, since it is smaller than the sum of its proper divisors (2354192).

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

1646560 is a wasteful number, since it uses less digits than its factorization.

1646560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307 (or 299 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 1646560 is about 1283.1835410416. The cubic root of 1646560 is about 118.0843981098.

Subtracting from 1646560 its reverse (656461), we obtain a palindrome (990099).

It can be divided in two parts, 164 and 6560, that added together give a square (6724 = 82²).

The spelling of 1646560 in words is "one million, six hundred forty-six thousand, five hundred sixty".