280474 has 4 divisors (see below), whose sum is σ = 420714. Its totient is φ = 140236.

The previous prime is 280463. The next prime is 280487. The reversal of 280474 is 474082.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 154449 + 126025 = 393^2 + 355^2 .

It is an Ulam number.

It is a plaindrome in base 16.

It is an unprimeable number.

280474 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 as a sum of consecutive naturals, namely, 70117 + ... + 70120.

2²⁸⁰⁴⁷⁴ is an apocalyptic number.

280474 is a deficient number, since it is larger than the sum of its proper divisors (140240).

280474 is a wasteful number, since it uses less digits than its factorization.

280474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140239.

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 280474 is about 529.5979607211. The cubic root of 280474 is about 65.4582217118.

The spelling of 280474 in words is "two hundred eighty thousand, four hundred seventy-four".