1985940 has 144 divisors (see below), whose sum is σ = 7076160. Its totient is φ = 445440.

The previous prime is 1985939. The next prime is 1985987. The reversal of 1985940 is 495891.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1985895 and 1985904.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33631 + ... + 33689.

It is an arithmetic number, because the mean of its divisors is an integer number (49140).

2^1985940 is an apocalyptic number.

1985940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1985940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3538080).

1985940 is an abundant number, since it is smaller than the sum of its proper divisors (5090220).

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

1985940 is a wasteful number, since it uses less digits than its factorization.

1985940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102 (or 97 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 1985940 is about 1409.2338343937. The cubic root of 1985940 is about 125.6961689261.

The spelling of 1985940 in words is "one million, nine hundred eighty-five thousand, nine hundred forty".