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8445 = 35563
BaseRepresentation
bin10000011111101
3102120210
42003331
5232240
6103033
733423
oct20375
912523
108445
116388
124a79
133ac8
143113
152780
hex20fd

8445 has 8 divisors (see below), whose sum is σ = 13536. Its totient is φ = 4496.

The previous prime is 8443. The next prime is 8447. The reversal of 8445 is 5448.

8445 = T36 + T37 + ... + T45.

8445 is nontrivially palindromic in base 14.

8445 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (8443) and next prime (8447).

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

It is a cyclic number.

It is not a de Polignac number, because 8445 - 21 = 8443 is a prime.

8445 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 8445.

It is not an unprimeable number, because it can be changed into a prime (8443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 267 + ... + 296.

It is an arithmetic number, because the mean of its divisors is an integer number (1692).

28445 is an apocalyptic number.

It is an amenable number.

8445 is a deficient number, since it is larger than the sum of its proper divisors (5091).

8445 is a wasteful number, since it uses less digits than its factorization.

8445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571.

The product of its digits is 640, while the sum is 21.

The square root of 8445 is about 91.8966811153. The cubic root of 8445 is about 20.3641623772.

The spelling of 8445 in words is "eight thousand, four hundred forty-five".

Divisors: 1 3 5 15 563 1689 2815 8445