1985775900 has 36 divisors (see below), whose sum is σ = 5745512472. Its totient is φ = 529540160.

The previous prime is 1985775881. The next prime is 1985775901. The reversal of 1985775900 is 95775891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985775901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3309327 + ... + 3309926.

Almost surely, 2^1985775900 is an apocalyptic number.

1985775900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1985775900 is an abundant number, since it is smaller than the sum of its proper divisors (3759736572).

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

1985775900 is a wasteful number, since it uses less digits than its factorization.

1985775900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6619270 (or 6619263 counting only the distinct ones).

The product of its (nonzero) digits is 793800, while the sum is 51.

The square root of 1985775900 is about 44562.0455096038. The cubic root of 1985775900 is about 1256.9270670175.

The spelling of 1985775900 in words is "one billion, nine hundred eighty-five million, seven hundred seventy-five thousand, nine hundred".