409949 has 4 divisors (see below), whose sum is σ = 413820. Its totient is φ = 406080.

The previous prime is 409943. The next prime is 409951. The reversal of 409949 is 949904.

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 235225 + 174724 = 485^2 + 418^2 .

It is a cyclic number.

It is not a de Polignac number, because 409949 - 2⁴ = 409933 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

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, 1772 + ... + 1989.

It is an arithmetic number, because the mean of its divisors is an integer number (103455).

2⁴⁰⁹⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

409949 is a deficient number, since it is larger than the sum of its proper divisors (3871).

409949 is a wasteful number, since it uses less digits than its factorization.

409949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3870.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 409949 is about 640.2725981955. The cubic root of 409949 is about 74.2865079867.

The spelling of 409949 in words is "four hundred nine thousand, nine hundred forty-nine".