280047 has 8 divisors (see below), whose sum is σ = 375856. Its totient is φ = 185472.

The previous prime is 280037. The next prime is 280061. The reversal of 280047 is 740082.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 280047 - 2⁴ = 280031 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280047.

It is not an unprimeable number, because it can be changed into a prime (280037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 663 + ... + 999.

It is an arithmetic number, because the mean of its divisors is an integer number (46982).

2²⁸⁰⁰⁴⁷ is an apocalyptic number.

280047 is a deficient number, since it is larger than the sum of its proper divisors (95809).

280047 is a wasteful number, since it uses less digits than its factorization.

280047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 280047 is about 529.1946711750. The cubic root of 280047 is about 65.4249864779.

The spelling of 280047 in words is "two hundred eighty thousand, forty-seven".