280401 has 16 divisors (see below), whose sum is σ = 423360. Its totient is φ = 163520.

The previous prime is 280373. The next prime is 280409. The reversal of 280401 is 104082.

It is a cyclic number.

It is not a de Polignac number, because 280401 - 2⁶ = 280337 is a prime.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280401.

It is not an unprimeable number, because it can be changed into a prime (280409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 811 + ... + 1103.

It is an arithmetic number, because the mean of its divisors is an integer number (26460).

2²⁸⁰⁴⁰¹ is an apocalyptic number.

It is an amenable number.

280401 is a deficient number, since it is larger than the sum of its proper divisors (142959).

280401 is a wasteful number, since it uses less digits than its factorization.

280401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 280401 is about 529.5290360311. The cubic root of 280401 is about 65.4525422016.

Adding to 280401 its reverse (104082), we get a palindrome (384483).

The spelling of 280401 in words is "two hundred eighty thousand, four hundred one".