409947 has 4 divisors (see below), whose sum is σ = 546600. Its totient is φ = 273296.

The previous prime is 409943. The next prime is 409951. The reversal of 409947 is 749904.

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 (409943) and next prime (409951).

It is a cyclic number.

It is not a de Polignac number, because 409947 - 2² = 409943 is a prime.

It is a D-number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (409943) 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, 68322 + ... + 68327.

It is an arithmetic number, because the mean of its divisors is an integer number (136650).

2⁴⁰⁹⁹⁴⁷ is an apocalyptic number.

409947 is a deficient number, since it is larger than the sum of its proper divisors (136653).

409947 is a wasteful number, since it uses less digits than its factorization.

409947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136652.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 409947 is about 640.2710363588. The cubic root of 409947 is about 74.2863871804.

The spelling of 409947 in words is "four hundred nine thousand, nine hundred forty-seven".