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7947 = 32883
BaseRepresentation
bin1111100001011
3101220100
41330023
5223242
6100443
732112
oct17413
911810
107947
115a75
124723
133804
142c79
15254c
hex1f0b

7947 has 6 divisors (see below), whose sum is σ = 11492. Its totient is φ = 5292.

The previous prime is 7937. The next prime is 7949. The reversal of 7947 is 7497.

It is not a de Polignac number, because 7947 - 26 = 7883 is a prime.

It is a Duffinian number.

7947 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 7947.

It is not an unprimeable number, because it can be changed into a prime (7949) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 433 + ... + 450.

27947 is an apocalyptic number.

7947 is a deficient number, since it is larger than the sum of its proper divisors (3545).

7947 is a wasteful number, since it uses less digits than its factorization.

7947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889 (or 886 counting only the distinct ones).

The product of its digits is 1764, while the sum is 27.

The square root of 7947 is about 89.1459477486. The cubic root of 7947 is about 19.9557354380.

The spelling of 7947 in words is "seven thousand, nine hundred forty-seven".

Divisors: 1 3 9 883 2649 7947