403280 has 30 divisors (see below), whose sum is σ = 951018. Its totient is φ = 159040.

The previous prime is 403267. The next prime is 403289. The reversal of 403280 is 82304.

It can be written as a sum of positive squares in only one way, i.e., 322624 + 80656 = 568^2 + 284^2 .

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 403280.

It is not an unprimeable number, because it can be changed into a prime (403289) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5645 + ... + 5715.

2⁴⁰³²⁸⁰ is an apocalyptic number.

403280 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 403280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (475509).

403280 is an abundant number, since it is smaller than the sum of its proper divisors (547738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

403280 is an equidigital number, since it uses as much as digits as its factorization.

403280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 403280 is about 635.0433056099. The cubic root of 403280 is about 73.8814757127.

Adding to 403280 its reverse (82304), we get a palindrome (485584).

The spelling of 403280 in words is "four hundred three thousand, two hundred eighty".