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280225 = 52111019
BaseRepresentation
bin1000100011010100001
3112020101201
41010122201
532431400
610001201
72244661
oct1043241
9466351
10280225
111815a0
12116201
139a71a
14741a1
155806a
hex446a1

280225 has 12 divisors (see below), whose sum is σ = 379440. Its totient is φ = 203600.

The previous prime is 280223. The next prime is 280229. The reversal of 280225 is 522082.

It is not a de Polignac number, because 280225 - 21 = 280223 is a prime.

It is not an unprimeable number, because it can be changed into a prime (280223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 235 + ... + 784.

It is an arithmetic number, because the mean of its divisors is an integer number (31620).

2280225 is an apocalyptic number.

280225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

280225 is a deficient number, since it is larger than the sum of its proper divisors (99215).

280225 is a wasteful number, since it uses less digits than its factorization.

280225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040 (or 1035 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 280225 is about 529.3628245353. The cubic root of 280225 is about 65.4388450816.

It can be divided in two parts, 280 and 225, that added together give a palindrome (505).

The spelling of 280225 in words is "two hundred eighty thousand, two hundred twenty-five".