409421 has 4 divisors (see below), whose sum is σ = 410844. Its totient is φ = 408000.

The previous prime is 409397. The next prime is 409429. The reversal of 409421 is 124904.

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

It can be written as a sum of positive squares in 2 ways, for example, as 346921 + 62500 = 589^2 + 250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-409421 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 409393 and 409402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409429) 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, 110 + ... + 911.

It is an arithmetic number, because the mean of its divisors is an integer number (102711).

2⁴⁰⁹⁴²¹ is an apocalyptic number.

It is an amenable number.

409421 is a deficient number, since it is larger than the sum of its proper divisors (1423).

409421 is a wasteful number, since it uses less digits than its factorization.

409421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1422.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 409421 is about 639.8601409683. The cubic root of 409421 is about 74.2546014750.

The spelling of 409421 in words is "four hundred nine thousand, four hundred twenty-one".