280946 has 4 divisors (see below), whose sum is σ = 421422. Its totient is φ = 140472.

The previous prime is 280939. The next prime is 280949. The reversal of 280946 is 649082.

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., 255025 + 25921 = 505^2 + 161^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280946.

It is not an unprimeable number, because it can be changed into a prime (280949) by changing a digit.

280946 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, 70235 + ... + 70238.

2²⁸⁰⁹⁴⁶ is an apocalyptic number.

280946 is a deficient number, since it is larger than the sum of its proper divisors (140476).

280946 is a wasteful number, since it uses less digits than its factorization.

280946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140475.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 280946 is about 530.0433944499. The cubic root of 280946 is about 65.4949202595.

The spelling of 280946 in words is "two hundred eighty thousand, nine hundred forty-six".