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12990 = 235433
BaseRepresentation
bin11001010111110
3122211010
43022332
5403430
6140050
752605
oct31276
918733
1012990
11983a
127626
135bb3
144a3c
153cb0
hex32be

12990 has 16 divisors (see below), whose sum is σ = 31248. Its totient is φ = 3456.

The previous prime is 12983. The next prime is 13001. The reversal of 12990 is 9921.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

12990 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 7 ways as a sum of consecutive naturals, for example, 187 + ... + 246.

It is an arithmetic number, because the mean of its divisors is an integer number (1953).

212990 is an apocalyptic number.

12990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12990 is an abundant number, since it is smaller than the sum of its proper divisors (18258).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15624).

12990 is a wasteful number, since it uses less digits than its factorization.

12990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443.

The product of its (nonzero) digits is 162, while the sum is 21.

The square root of 12990 is about 113.9736811725. The cubic root of 12990 is about 23.5073162673.

The spelling of 12990 in words is "twelve thousand, nine hundred ninety".

Divisors: 1 2 3 5 6 10 15 30 433 866 1299 2165 2598 4330 6495 12990