408421 has 8 divisors (see below), whose sum is σ = 446040. Its totient is φ = 371712.

The previous prime is 408413. The next prime is 408427. The reversal of 408421 is 124804.

It can be written as a sum of positive squares in 4 ways, for example, as 100 + 408321 = 10^2 + 639^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 408421 - 2³ = 408413 is a prime.

It is a Duffinian number.

408421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (408427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 981 + ... + 1333.

It is an arithmetic number, because the mean of its divisors is an integer number (55755).

2⁴⁰⁸⁴²¹ is an apocalyptic number.

It is an amenable number.

408421 is a deficient number, since it is larger than the sum of its proper divisors (37619).

408421 is a wasteful number, since it uses less digits than its factorization.

408421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 408421 is about 639.0782424711. The cubic root of 408421 is about 74.1940972193.

The spelling of 408421 in words is "four hundred eight thousand, four hundred twenty-one".