1665630 has 64 divisors (see below), whose sum is σ = 4608000. Its totient is φ = 427680.

The previous prime is 1665623. The next prime is 1665647. The reversal of 1665630 is 365661.

1665630 is a `hidden beast` number, since 1 + 6 + 656 + 3 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1665594 and 1665603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8271 + ... + 8469.

It is an arithmetic number, because the mean of its divisors is an integer number (72000).

2^1665630 is an apocalyptic number.

1665630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1665630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2304000).

1665630 is an abundant number, since it is smaller than the sum of its proper divisors (2942370).

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

1665630 is a wasteful number, since it uses less digits than its factorization.

1665630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246 (or 240 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 1665630 is about 1290.5928870097. The cubic root of 1665630 is about 118.5385229664.

The spelling of 1665630 in words is "one million, six hundred sixty-five thousand, six hundred thirty".