280393 has 8 divisors (see below), whose sum is σ = 298368. Its totient is φ = 262944.

The previous prime is 280373. The next prime is 280409. The reversal of 280393 is 393082.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 280393 - 2¹³ = 272201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280303) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1596 + ... + 1762.

It is an arithmetic number, because the mean of its divisors is an integer number (37296).

2²⁸⁰³⁹³ is an apocalyptic number.

280393 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

280393 is a deficient number, since it is larger than the sum of its proper divisors (17975).

280393 is a wasteful number, since it uses less digits than its factorization.

280393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 280393 is about 529.5214820949. The cubic root of 280393 is about 65.4519197296.

The spelling of 280393 in words is "two hundred eighty thousand, three hundred ninety-three".