409966 has 4 divisors (see below), whose sum is σ = 614952. Its totient is φ = 204982.

The previous prime is 409961. The next prime is 409967. The reversal of 409966 is 669904.

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

It is a pancake number, because a pancake can be divided into 409966 parts by 905 straight cuts.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102490 + ... + 102493.

It is an arithmetic number, because the mean of its divisors is an integer number (153738).

2⁴⁰⁹⁹⁶⁶ is an apocalyptic number.

409966 is a deficient number, since it is larger than the sum of its proper divisors (204986).

409966 is a wasteful number, since it uses less digits than its factorization.

409966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204985.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 409966 is about 640.2858736533. The cubic root of 409966 is about 74.2875348244.

The spelling of 409966 in words is "four hundred nine thousand, nine hundred sixty-six".