1668750 has 48 divisors (see below), whose sum is σ = 4218480. Its totient is φ = 440000.

The previous prime is 1668743. The next prime is 1668757. The reversal of 1668750 is 578661.

It is an interprime number because it is at equal distance from previous prime (1668743) and next prime (1668757).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668757) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18706 + ... + 18794.

It is an arithmetic number, because the mean of its divisors is an integer number (87885).

2^1668750 is an apocalyptic number.

1668750 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 1668750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2109240).

1668750 is an abundant number, since it is smaller than the sum of its proper divisors (2549730).

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

1668750 is an frugal number, since it uses more digits than its factorization.

1668750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119 (or 99 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 1668750 is about 1291.8010682764. The cubic root of 1668750 is about 118.6124908760.

The spelling of 1668750 in words is "one million, six hundred sixty-eight thousand, seven hundred fifty".