1641856 has 32 divisors (see below), whose sum is σ = 3329280. Its totient is φ = 806400.

The previous prime is 1641841. The next prime is 1641863. The reversal of 1641856 is 6581461.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×1641856² = 5391382249472, 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, 12865 + ... + 12991.

It is an arithmetic number, because the mean of its divisors is an integer number (104040).

2^1641856 is an apocalyptic number.

1641856 is a gapful number since it is divisible by the number (16) 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 1641856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1664640).

1641856 is an abundant number, since it is smaller than the sum of its proper divisors (1687424).

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

1641856 is a wasteful number, since it uses less digits than its factorization.

1641856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242 (or 230 counting only the distinct ones).

The product of its digits is 5760, while the sum is 31.

The square root of 1641856 is about 1281.3492888358. The cubic root of 1641856 is about 117.9718404509.

The spelling of 1641856 in words is "one million, six hundred forty-one thousand, eight hundred fifty-six".