1986240 has 56 divisors (see below), whose sum is σ = 6309360. Its totient is φ = 529408.

The previous prime is 1986233. The next prime is 1986253. The reversal of 1986240 is 426891.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1986198 and 1986207.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75 + ... + 1994.

2^1986240 is an apocalyptic number.

1986240 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 1986240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3154680).

1986240 is an abundant number, since it is smaller than the sum of its proper divisors (4323120).

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

1986240 is a wasteful number, since it uses less digits than its factorization.

1986240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2089 (or 2079 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 1986240 is about 1409.3402711907. The cubic root of 1986240 is about 125.7024979109.

The spelling of 1986240 in words is "one million, nine hundred eighty-six thousand, two hundred forty".