409649 has 4 divisors (see below), whose sum is σ = 433764. Its totient is φ = 385536.

The previous prime is 409639. The next prime is 409657. The reversal of 409649 is 946904.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 322624 + 87025 = 568^2 + 295^2 .

It is a cyclic number.

It is not a de Polignac number, because 409649 - 2¹² = 405553 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 (409609) 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, 12032 + ... + 12065.

It is an arithmetic number, because the mean of its divisors is an integer number (108441).

2⁴⁰⁹⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

409649 is a deficient number, since it is larger than the sum of its proper divisors (24115).

409649 is a wasteful number, since it uses less digits than its factorization.

409649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24114.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 409649 is about 640.0382801052. The cubic root of 409649 is about 74.2683826501.

It can be divided in two parts, 4096 and 49, that multiplied together give a square (200704 = 448²).

The spelling of 409649 in words is "four hundred nine thousand, six hundred forty-nine".