402280 has 32 divisors (see below), whose sum is σ = 923400. Its totient is φ = 157696.

The previous prime is 402277. The next prime is 402299. The reversal of 402280 is 82204.

It can be written as a sum of positive squares in 4 ways, for example, as 133956 + 268324 = 366^2 + 518^2 .

It is a plaindrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3504 + ... + 3616.

2⁴⁰²²⁸⁰ is an apocalyptic number.

402280 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 402280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (461700).

402280 is an abundant number, since it is smaller than the sum of its proper divisors (521120).

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

402280 is a wasteful number, since it uses less digits than its factorization.

402280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 402280 is about 634.2554690344. The cubic root of 402280 is about 73.8203580218.

Adding to 402280 its reverse (82204), we get a palindrome (484484).

The spelling of 402280 in words is "four hundred two thousand, two hundred eighty".