1656320 has 40 divisors (see below), whose sum is σ = 3977424. Its totient is φ = 661504.

The previous prime is 1656313. The next prime is 1656323. The reversal of 1656320 is 236561.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1656323) 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, 2237 + ... + 2883.

2^1656320 is an apocalyptic number.

1656320 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 1656320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1988712).

1656320 is an abundant number, since it is smaller than the sum of its proper divisors (2321104).

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

1656320 is an frugal number, since it uses more digits than its factorization.

1656320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670 (or 654 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 1656320 is about 1286.9809633402. The cubic root of 1656320 is about 118.3172540915.

The spelling of 1656320 in words is "one million, six hundred fifty-six thousand, three hundred twenty".