409128879 has 4 divisors (see below), whose sum is σ = 545505176. Its totient is φ = 272752584.

The previous prime is 409128877. The next prime is 409128883. The reversal of 409128879 is 978821904.

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

It is not a de Polignac number, because 409128879 - 2¹ = 409128877 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 (409128877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68188144 + ... + 68188149.

It is an arithmetic number, because the mean of its divisors is an integer number (136376294).

Almost surely, 2^409128879 is an apocalyptic number.

409128879 is a deficient number, since it is larger than the sum of its proper divisors (136376297).

409128879 is a wasteful number, since it uses less digits than its factorization.

409128879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136376296.

The product of its (nonzero) digits is 290304, while the sum is 48.

The square root of 409128879 is about 20226.9344933927. The cubic root of 409128879 is about 742.3693710724.

The spelling of 409128879 in words is "four hundred nine million, one hundred twenty-eight thousand, eight hundred seventy-nine".