421280 has 24 divisors (see below), whose sum is σ = 995652. Its totient is φ = 168448.

The previous prime is 421279. The next prime is 421303. The reversal of 421280 is 82124.

421280 = T₄₀₈ + T₄₀₉ + ... + T₄₁₂.

It can be written as a sum of positive squares in 2 ways, for example, as 394384 + 26896 = 628^2 + 164^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1157 + ... + 1476.

2⁴²¹²⁸⁰ is an apocalyptic number.

421280 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

421280 is an abundant number, since it is smaller than the sum of its proper divisors (574372).

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

421280 is a wasteful number, since it uses less digits than its factorization.

421280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2648 (or 2640 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 421280 is about 649.0608600124. The cubic root of 421280 is about 74.9647241515.

The spelling of 421280 in words is "four hundred twenty-one thousand, two hundred eighty".