1985900 has 36 divisors (see below), whose sum is σ = 4926768. Its totient is φ = 680640.

The previous prime is 1985897. The next prime is 1985903. The reversal of 1985900 is 95891.

It is an interprime number because it is at equal distance from previous prime (1985897) and next prime (1985903).

It is not an unprimeable number, because it can be changed into a prime (1985903) 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, 719 + ... + 2118.

2^1985900 is an apocalyptic number.

1985900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1985900 is an abundant number, since it is smaller than the sum of its proper divisors (2940868).

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

1985900 is a wasteful number, since it uses less digits than its factorization.

1985900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2858 (or 2851 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 1985900 is about 1409.2196422134. The cubic root of 1985900 is about 125.6953250133.

The spelling of 1985900 in words is "one million, nine hundred eighty-five thousand, nine hundred".