408385779 has 4 divisors (see below), whose sum is σ = 544514376. Its totient is φ = 272257184.

The previous prime is 408385777. The next prime is 408385799. The reversal of 408385779 is 977583804.

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 408385779 - 2¹ = 408385777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (408385777) 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, 68064294 + ... + 68064299.

It is an arithmetic number, because the mean of its divisors is an integer number (136128594).

Almost surely, 2^408385779 is an apocalyptic number.

408385779 is a deficient number, since it is larger than the sum of its proper divisors (136128597).

408385779 is a wasteful number, since it uses less digits than its factorization.

408385779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136128596.

The product of its (nonzero) digits is 1693440, while the sum is 51.

The square root of 408385779 is about 20208.5570736755. The cubic root of 408385779 is about 741.9196439936.

The spelling of 408385779 in words is "four hundred eight million, three hundred eighty-five thousand, seven hundred seventy-nine".