280394 has 4 divisors (see below), whose sum is σ = 420594. Its totient is φ = 140196.

The previous prime is 280373. The next prime is 280409. The reversal of 280394 is 493082.

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., 198025 + 82369 = 445^2 + 287^2 .

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280394.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70097 + ... + 70100.

2²⁸⁰³⁹⁴ is an apocalyptic number.

280394 is a deficient number, since it is larger than the sum of its proper divisors (140200).

280394 is a wasteful number, since it uses less digits than its factorization.

280394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140199.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 280394 is about 529.5224263428. The cubic root of 280394 is about 65.4519975392.

The spelling of 280394 in words is "two hundred eighty thousand, three hundred ninety-four".