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12884985 = 325286333
BaseRepresentation
bin110001001001…
…101111111001
3220020121212200
4301021233321
511244304420
61140100413
7214343361
oct61115771
926217780
1012884985
117300753
124394709
132891a69
1419d59a1
1511e7b90
hexc49bf9

12884985 has 12 divisors (see below), whose sum is σ = 22334052. Its totient is φ = 6871968.

The previous prime is 12884959. The next prime is 12885001. The reversal of 12884985 is 58948821.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7225344 + 5659641 = 2688^2 + 2379^2 .

It is not a de Polignac number, because 12884985 - 27 = 12884857 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 286333 = 12884985 / (1 + 2 + 8 + 8 + 4 + 9 + 8 + 5).

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 12884985.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 143122 + ... + 143211.

It is an arithmetic number, because the mean of its divisors is an integer number (1861171).

Almost surely, 212884985 is an apocalyptic number.

12884985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12884985 is a deficient number, since it is larger than the sum of its proper divisors (9449067).

12884985 is a wasteful number, since it uses less digits than its factorization.

12884985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286344 (or 286341 counting only the distinct ones).

The product of its digits is 184320, while the sum is 45.

The square root of 12884985 is about 3589.5661297711. The cubic root of 12884985 is about 234.4379809410.

The spelling of 12884985 in words is "twelve million, eight hundred eighty-four thousand, nine hundred eighty-five".

Divisors: 1 3 5 9 15 45 286333 858999 1431665 2576997 4294995 12884985