409894 has 4 divisors (see below), whose sum is σ = 614844. Its totient is φ = 204946.

The previous prime is 409891. The next prime is 409897. The reversal of 409894 is 498904.

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

It is an interprime number because it is at equal distance from previous prime (409891) and next prime (409897).

It is an Ulam number.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102472 + ... + 102475.

It is an arithmetic number, because the mean of its divisors is an integer number (153711).

2⁴⁰⁹⁸⁹⁴ is an apocalyptic number.

409894 is a deficient number, since it is larger than the sum of its proper divisors (204950).

409894 is a wasteful number, since it uses less digits than its factorization.

409894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204949.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 409894 is about 640.2296462989. The cubic root of 409894 is about 74.2831856705.

The spelling of 409894 in words is "four hundred nine thousand, eight hundred ninety-four".