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7900 = 225279
BaseRepresentation
bin1111011011100
3101211121
41323130
5223100
6100324
732014
oct17334
911747
107900
115a32
1246a4
133799
142c44
15251a
hex1edc

7900 has 18 divisors (see below), whose sum is σ = 17360. Its totient is φ = 3120.

The previous prime is 7883. The next prime is 7901. The reversal of 7900 is 97.

Adding to 7900 its reverse (97), we get a palindrome (7997).

It is a happy number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7901) by changing a digit.

7900 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 61 + ... + 139.

27900 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8680).

7900 is an abundant number, since it is smaller than the sum of its proper divisors (9460).

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

7900 is a wasteful number, since it uses less digits than its factorization.

7900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93 (or 86 counting only the distinct ones).

The product of its (nonzero) digits is 63, while the sum is 16.

The square root of 7900 is about 88.8819441732. The cubic root of 7900 is about 19.9163170129.

The spelling of 7900 in words is "seven thousand, nine hundred".

Divisors: 1 2 4 5 10 20 25 50 79 100 158 316 395 790 1580 1975 3950 7900