1666350 has 108 divisors (see below), whose sum is σ = 5348616. Its totient is φ = 364320.

The previous prime is 1666339. The next prime is 1666351. The reversal of 1666350 is 536661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666351) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 72439 + ... + 72461.

2^1666350 is an apocalyptic number.

1666350 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 1666350, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2674308).

1666350 is an abundant number, since it is smaller than the sum of its proper divisors (3682266).

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

1666350 is a wasteful number, since it uses less digits than its factorization.

1666350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71 (or 40 counting only the distinct ones).

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

The square root of 1666350 is about 1290.8717984370. The cubic root of 1666350 is about 118.5556006771. Note that the first 3 decimals are identical.

It can be divided in two parts, 1666 and 350, that added together give a triangular number (2016 = T₆₃).

The spelling of 1666350 in words is "one million, six hundred sixty-six thousand, three hundred fifty".