409623 has 4 divisors (see below), whose sum is σ = 546168. Its totient is φ = 273080.

The previous prime is 409609. The next prime is 409639. The reversal of 409623 is 326904.

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 409623 - 2¹² = 405527 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 409593 and 409602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409693) 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 in 3 ways as a sum of consecutive naturals, for example, 68268 + ... + 68273.

It is an arithmetic number, because the mean of its divisors is an integer number (136542).

2⁴⁰⁹⁶²³ is an apocalyptic number.

409623 is a deficient number, since it is larger than the sum of its proper divisors (136545).

409623 is a wasteful number, since it uses less digits than its factorization.

409623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136544.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 409623 is about 640.0179684978. The cubic root of 409623 is about 74.2668113709.

The spelling of 409623 in words is "four hundred nine thousand, six hundred twenty-three".