1985620 has 48 divisors (see below), whose sum is σ = 5136768. Its totient is φ = 627840.

The previous prime is 1985593. The next prime is 1985623. The reversal of 1985620 is 265891.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1275 + ... + 2365.

It is an arithmetic number, because the mean of its divisors is an integer number (107016).

2^1985620 is an apocalyptic number.

1985620 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 1985620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2568384).

1985620 is an abundant number, since it is smaller than the sum of its proper divisors (3151148).

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

1985620 is a wasteful number, since it uses less digits than its factorization.

1985620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120 (or 1118 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 1985620 is about 1409.1202929488. The cubic root of 1985620 is about 125.6894173064.

The spelling of 1985620 in words is "one million, nine hundred eighty-five thousand, six hundred twenty".