409939131605 has 32 divisors (see below), whose sum is σ = 550779844608. Its totient is φ = 291417753600.

The previous prime is 409939131599. The next prime is 409939131619. The reversal of 409939131605 is 506131939904.

It is a de Polignac number, because none of the positive numbers 2^k-409939131605 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1789217 + ... + 2005286.

It is an arithmetic number, because the mean of its divisors is an integer number (17211870144).

Almost surely, 2^409939131605 is an apocalyptic number.

It is an amenable number.

409939131605 is a deficient number, since it is larger than the sum of its proper divisors (140840713003).

409939131605 is a wasteful number, since it uses less digits than its factorization.

409939131605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3794597.

The product of its (nonzero) digits is 787320, while the sum is 50.

The spelling of 409939131605 in words is "four hundred nine billion, nine hundred thirty-nine million, one hundred thirty-one thousand, six hundred five".