280449 has 32 divisors (see below), whose sum is σ = 483840. Its totient is φ = 158976.

The previous prime is 280411. The next prime is 280451. The reversal of 280449 is 944082.

It is not a de Polignac number, because 280449 - 2⁷ = 280321 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (280409) 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 31 ways as a sum of consecutive naturals, for example, 5944 + ... + 5990.

It is an arithmetic number, because the mean of its divisors is an integer number (15120).

2²⁸⁰⁴⁴⁹ is an apocalyptic number.

It is an amenable number.

280449 is a deficient number, since it is larger than the sum of its proper divisors (203391).

280449 is a wasteful number, since it uses less digits than its factorization.

280449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86 (or 80 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 280449 is about 529.5743573852. The cubic root of 280449 is about 65.4562767850.

It can be divided in two parts, 280 and 449, that added together give a 6-th power (729 = 3⁶).

The spelling of 280449 in words is "two hundred eighty thousand, four hundred forty-nine".