1660620 has 48 divisors (see below), whose sum is σ = 5009760. Its totient is φ = 408576.

The previous prime is 1660609. The next prime is 1660661. The reversal of 1660620 is 260661.

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 15 ways as a sum of consecutive naturals, for example, 285 + ... + 1844.

It is an arithmetic number, because the mean of its divisors is an integer number (104370).

2^1660620 is an apocalyptic number.

1660620 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 1660620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2504880).

1660620 is an abundant number, since it is smaller than the sum of its proper divisors (3349140).

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

1660620 is a wasteful number, since it uses less digits than its factorization.

1660620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2154 (or 2152 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1660620 is about 1288.6504568734. The cubic root of 1660620 is about 118.4195540811.

The spelling of 1660620 in words is "one million, six hundred sixty thousand, six hundred twenty".