409847 has 4 divisors (see below), whose sum is σ = 411840. Its totient is φ = 407856.

The previous prime is 409841. The next prime is 409861. The reversal of 409847 is 748904.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 409847 - 2⁴ = 409831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409841) 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, 647 + ... + 1112.

It is an arithmetic number, because the mean of its divisors is an integer number (102960).

2⁴⁰⁹⁸⁴⁷ is an apocalyptic number.

409847 is a deficient number, since it is larger than the sum of its proper divisors (1993).

409847 is a wasteful number, since it uses less digits than its factorization.

409847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1992.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 409847 is about 640.1929396674. The cubic root of 409847 is about 74.2803463647.

The spelling of 409847 in words is "four hundred nine thousand, eight hundred forty-seven".