280442 has 4 divisors (see below), whose sum is σ = 420666. Its totient is φ = 140220.

The previous prime is 280411. The next prime is 280451. The reversal of 280442 is 244082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 244082 = 2 ⋅122041.

It can be written as a sum of positive squares in only one way, i.e., 261121 + 19321 = 511^2 + 139^2 .

It is a plaindrome in base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280442.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70109 + ... + 70112.

2²⁸⁰⁴⁴² is an apocalyptic number.

280442 is a deficient number, since it is larger than the sum of its proper divisors (140224).

280442 is a wasteful number, since it uses less digits than its factorization.

280442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140223.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 280442 is about 529.5677482627. The cubic root of 280442 is about 65.4557321848.

The spelling of 280442 in words is "two hundred eighty thousand, four hundred forty-two".