1643055 has 8 divisors (see below), whose sum is σ = 2628912. Its totient is φ = 876288.

The previous prime is 1643039. The next prime is 1643069. The reversal of 1643055 is 5503461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1643055 - 2⁴ = 1643039 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54754 + ... + 54783.

It is an arithmetic number, because the mean of its divisors is an integer number (328614).

2^1643055 is an apocalyptic number.

1643055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1643055 is a deficient number, since it is larger than the sum of its proper divisors (985857).

1643055 is a wasteful number, since it uses less digits than its factorization.

1643055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109545.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 1643055 is about 1281.8170696320. The cubic root of 1643055 is about 118.0005506055. Note that the first 3 decimals are identical.

It can be divided in two parts, 16 and 43055, that added together give a triangular number (43071 = T₂₉₃).

The spelling of 1643055 in words is "one million, six hundred forty-three thousand, fifty-five".