280423 has 16 divisors (see below), whose sum is σ = 344736. Its totient is φ = 224640.

The previous prime is 280411. The next prime is 280451. The reversal of 280423 is 324082.

It is a happy number.

It is not a de Polignac number, because 280423 - 2¹³ = 272231 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 280423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280463) 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, 5265 + ... + 5317.

It is an arithmetic number, because the mean of its divisors is an integer number (21546).

2²⁸⁰⁴²³ is an apocalyptic number.

280423 is a deficient number, since it is larger than the sum of its proper divisors (64313).

280423 is a wasteful number, since it uses less digits than its factorization.

280423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 280423 is about 529.5498087999. The cubic root of 280423 is about 65.4542539386.

It can be divided in two parts, 280 and 423, that added together give a triangular number (703 = T₃₇).

The spelling of 280423 in words is "two hundred eighty thousand, four hundred twenty-three".