409501 has 4 divisors (see below), whose sum is σ = 411232. Its totient is φ = 407772.

The previous prime is 409499. The next prime is 409517. The reversal of 409501 is 105904.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 409501 - 2¹ = 409499 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 (409901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 441 + ... + 1006.

It is an arithmetic number, because the mean of its divisors is an integer number (102808).

2⁴⁰⁹⁵⁰¹ is an apocalyptic number.

It is an amenable number.

409501 is a deficient number, since it is larger than the sum of its proper divisors (1731).

409501 is a wasteful number, since it uses less digits than its factorization.

409501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1730.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 409501 is about 639.9226515760. The cubic root of 409501 is about 74.2594375576.

The spelling of 409501 in words is "four hundred nine thousand, five hundred one".