280403423 has 4 divisors (see below), whose sum is σ = 296897760. Its totient is φ = 263909088.

The previous prime is 280403411. The next prime is 280403467. The reversal of 280403423 is 324304082.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 280403423 - 2⁶ = 280403359 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 280403392 and 280403401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280403323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8247143 + ... + 8247176.

It is an arithmetic number, because the mean of its divisors is an integer number (74224440).

Almost surely, 2^280403423 is an apocalyptic number.

280403423 is a deficient number, since it is larger than the sum of its proper divisors (16494337).

280403423 is a wasteful number, since it uses less digits than its factorization.

280403423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16494336.

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 280403423 is about 16745.2507595437. The cubic root of 280403423 is about 654.5273073047.

The spelling of 280403423 in words is "two hundred eighty million, four hundred three thousand, four hundred twenty-three".