1656560 has 20 divisors (see below), whose sum is σ = 3851688. Its totient is φ = 662592.

The previous prime is 1656559. The next prime is 1656563. The reversal of 1656560 is 656561.

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

It is a Smith number, since the sum of its digits (29) 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 (1656563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10274 + ... + 10433.

2^1656560 is an apocalyptic number.

1656560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1656560 is an abundant number, since it is smaller than the sum of its proper divisors (2195128).

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

1656560 is a wasteful number, since it uses less digits than its factorization.

1656560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20720 (or 20714 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 1656560 is about 1287.0742014352. The cubic root of 1656560 is about 118.3229685206.

Subtracting from 1656560 its reverse (656561), we obtain a palindrome (999999).

The spelling of 1656560 in words is "one million, six hundred fifty-six thousand, five hundred sixty".