6405998842 has 16 divisors (see below), whose sum is σ = 9652737600. Its totient is φ = 3188453632.

The previous prime is 6405998839. The next prime is 6405998843. The reversal of 6405998842 is 2488995046.

It is not an unprimeable number, because it can be changed into a prime (6405998843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 389763 + ... + 405865.

It is an arithmetic number, because the mean of its divisors is an integer number (603296100).

Almost surely, 2^6405998842 is an apocalyptic number.

6405998842 is a deficient number, since it is larger than the sum of its proper divisors (3246738758).

6405998842 is a wasteful number, since it uses less digits than its factorization.

6405998842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16997.

The product of its (nonzero) digits is 4976640, while the sum is 55.

The square root of 6405998842 is about 80037.4839809448. The cubic root of 6405998842 is about 1857.2154389232.

The spelling of 6405998842 in words is "six billion, four hundred five million, nine hundred ninety-eight thousand, eight hundred forty-two".