1585221942 has 8 divisors (see below), whose sum is σ = 3170443896. Its totient is φ = 528407312.

The previous prime is 1585221923. The next prime is 1585221959. The reversal of 1585221942 is 2491225851.

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

1585221942 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 1585221942.

It is a congruent number.

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, 132101823 + ... + 132101834.

It is an arithmetic number, because the mean of its divisors is an integer number (396305487).

Almost surely, 2^1585221942 is an apocalyptic number.

1585221942 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1585221942 is a wasteful number, since it uses less digits than its factorization.

1585221942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264203662.

The product of its digits is 57600, while the sum is 39.

The square root of 1585221942 is about 39814.8457487907. The cubic root of 1585221942 is about 1165.9950096239.

The spelling of 1585221942 in words is "one billion, five hundred eighty-five million, two hundred twenty-one thousand, nine hundred forty-two".