409979 has 4 divisors (see below), whose sum is σ = 411720. Its totient is φ = 408240.

The previous prime is 409967. The next prime is 409987. The reversal of 409979 is 979904.

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 409979 - 2⁸ = 409723 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (409909) 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, 449 + ... + 1010.

It is an arithmetic number, because the mean of its divisors is an integer number (102930).

2⁴⁰⁹⁹⁷⁹ is an apocalyptic number.

409979 is a deficient number, since it is larger than the sum of its proper divisors (1741).

409979 is a wasteful number, since it uses less digits than its factorization.

409979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1740.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 409979 is about 640.2960252883. The cubic root of 409979 is about 74.2883200340.

The spelling of 409979 in words is "four hundred nine thousand, nine hundred seventy-nine".