409943979 has 12 divisors (see below), whose sum is σ = 608145616. Its totient is φ = 265909392.

The previous prime is 409943887. The next prime is 409944013. The reversal of 409943979 is 979349904.

It is not a de Polignac number, because 409943979 - 2¹⁵ = 409911211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (409942979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 615199 + ... + 615864.

Almost surely, 2^409943979 is an apocalyptic number.

409943979 is a deficient number, since it is larger than the sum of its proper divisors (198201637).

409943979 is a wasteful number, since it uses less digits than its factorization.

409943979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1231106 (or 1231103 counting only the distinct ones).

The product of its (nonzero) digits is 2204496, while the sum is 54.

The square root of 409943979 is about 20247.0733440663. The cubic root of 409943979 is about 742.8620470178.

The spelling of 409943979 in words is "four hundred nine million, nine hundred forty-three thousand, nine hundred seventy-nine".