418409 has 4 divisors (see below), whose sum is σ = 420180. Its totient is φ = 416640.

The previous prime is 418391. The next prime is 418423. The reversal of 418409 is 904814.

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 183184 + 235225 = 428^2 + 485^2 .

It is a cyclic number.

It is not a de Polignac number, because 418409 - 2¹² = 414313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (418459) 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, 464 + ... + 1025.

It is an arithmetic number, because the mean of its divisors is an integer number (105045).

2⁴¹⁸⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

418409 is a deficient number, since it is larger than the sum of its proper divisors (1771).

418409 is a wasteful number, since it uses less digits than its factorization.

418409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1770.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 418409 is about 646.8454220291. The cubic root of 418409 is about 74.7940423444.

The spelling of 418409 in words is "four hundred eighteen thousand, four hundred nine".