1985442956 has 36 divisors (see below), whose sum is σ = 4135807368. Its totient is φ = 831112128.

The previous prime is 1985442941. The next prime is 1985442967. The reversal of 1985442956 is 6592445891.

It is a junction number, because it is equal to n+sod(n) for n = 1985442898 and 1985442907.

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 11 ways as a sum of consecutive naturals, for example, 109361 + ... + 126216.

It is an arithmetic number, because the mean of its divisors is an integer number (114883538).

Almost surely, 2^1985442956 is an apocalyptic number.

It is an amenable number.

1985442956 is an abundant number, since it is smaller than the sum of its proper divisors (2150364412).

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

1985442956 is a wasteful number, since it uses less digits than its factorization.

1985442956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235638 (or 235629 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 53.

The square root of 1985442956 is about 44558.3096178479. The cubic root of 1985442956 is about 1256.8568157677.

The spelling of 1985442956 in words is "one billion, nine hundred eighty-five million, four hundred forty-two thousand, nine hundred fifty-six".