1660140 has 72 divisors (see below), whose sum is σ = 5267808. Its totient is φ = 422400.

The previous prime is 1660133. The next prime is 1660177. The reversal of 1660140 is 410661.

1660140 is a `hidden beast` number, since 1 + 660 + 1 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 23 ways as a sum of consecutive naturals, for example, 3940 + ... + 4340.

It is an arithmetic number, because the mean of its divisors is an integer number (73164).

2^1660140 is an apocalyptic number.

1660140 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 1660140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2633904).

1660140 is an abundant number, since it is smaller than the sum of its proper divisors (3607668).

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

1660140 is a wasteful number, since it uses less digits than its factorization.

1660140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439 (or 434 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1660140 is about 1288.4642020638. The cubic root of 1660140 is about 118.4081433101.

It can be divided in two parts, 16601 and 40, that added together give a square (16641 = 129²).

The spelling of 1660140 in words is "one million, six hundred sixty thousand, one hundred forty".