1605406042 has 8 divisors (see below), whose sum is σ = 2413857600. Its totient is φ = 800786844.

The previous prime is 1605406039. The next prime is 1605406057. The reversal of 1605406042 is 2406045061.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1605406042.

It is an unprimeable number.

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, 957042 + ... + 958717.

It is an arithmetic number, because the mean of its divisors is an integer number (301732200).

Almost surely, 2^1605406042 is an apocalyptic number.

1605406042 is a deficient number, since it is larger than the sum of its proper divisors (808451558).

1605406042 is a wasteful number, since it uses less digits than its factorization.

1605406042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1916180.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 1605406042 is about 40067.5185405835. The cubic root of 1605406042 is about 1170.9228946905.

The spelling of 1605406042 in words is "one billion, six hundred five million, four hundred six thousand, forty-two".