1985561796 has 48 divisors (see below), whose sum is σ = 4675587840. Its totient is φ = 655794720.

The previous prime is 1985561783. The next prime is 1985561803. The reversal of 1985561796 is 6971655891.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 657931 + ... + 660941.

It is an arithmetic number, because the mean of its divisors is an integer number (97408080).

Almost surely, 2^1985561796 is an apocalyptic number.

It is an amenable number.

1985561796 is an abundant number, since it is smaller than the sum of its proper divisors (2690026044).

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

1985561796 is a wasteful number, since it uses less digits than its factorization.

1985561796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3504 (or 3502 counting only the distinct ones).

The product of its digits is 4082400, while the sum is 57.

The square root of 1985561796 is about 44559.6431314255. The cubic root of 1985561796 is about 1256.8818919325.

The spelling of 1985561796 in words is "one billion, nine hundred eighty-five million, five hundred sixty-one thousand, seven hundred ninety-six".