409438 has 4 divisors (see below), whose sum is σ = 614160. Its totient is φ = 204718.

The previous prime is 409433. The next prime is 409441. The reversal of 409438 is 834904.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102358 + ... + 102361.

It is an arithmetic number, because the mean of its divisors is an integer number (153540).

2⁴⁰⁹⁴³⁸ is an apocalyptic number.

409438 is a deficient number, since it is larger than the sum of its proper divisors (204722).

409438 is a wasteful number, since it uses less digits than its factorization.

409438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204721.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 409438 is about 639.8734249834. The cubic root of 409438 is about 74.2556291953.

The spelling of 409438 in words is "four hundred nine thousand, four hundred thirty-eight".