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16805993 = 29579517
BaseRepresentation
bin100000000011…
…1000001101001
31011121211111012
41000013001221
513300242433
61400113305
7262564031
oct100070151
934554435
1016805993
119539656
125765835
133635699
1423368c1
15171e848
hex1007069

16805993 has 4 divisors (see below), whose sum is σ = 17385540. Its totient is φ = 16226448.

The previous prime is 16805981. The next prime is 16806007. The reversal of 16805993 is 39950861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39950861 = 371079753.

It can be written as a sum of positive squares in 2 ways, for example, as 10061584 + 6744409 = 3172^2 + 2597^2 .

It is a cyclic number.

It is not a de Polignac number, because 16805993 - 210 = 16804969 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16805993.

It is not an unprimeable number, because it can be changed into a prime (16805903) 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, 289730 + ... + 289787.

It is an arithmetic number, because the mean of its divisors is an integer number (4346385).

Almost surely, 216805993 is an apocalyptic number.

It is an amenable number.

16805993 is a deficient number, since it is larger than the sum of its proper divisors (579547).

16805993 is an equidigital number, since it uses as much as digits as its factorization.

16805993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579546.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 16805993 is about 4099.5113123396. The cubic root of 16805993 is about 256.1462837854.

The spelling of 16805993 in words is "sixteen million, eight hundred five thousand, nine hundred ninety-three".

Divisors: 1 29 579517 16805993