1683990 has 128 divisors (see below), whose sum is σ = 5667840. Its totient is φ = 349920.

The previous prime is 1683977. The next prime is 1684019. The reversal of 1683990 is 993861.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 153085 + ... + 153095.

It is an arithmetic number, because the mean of its divisors is an integer number (44280).

2^1683990 is an apocalyptic number.

1683990 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 1683990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2833920).

1683990 is an abundant number, since it is smaller than the sum of its proper divisors (3983850).

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

1683990 is an equidigital number, since it uses as much as digits as its factorization.

1683990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46 (or 28 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 1683990 is about 1297.6864027954. The cubic root of 1683990 is about 118.9724767456.

The spelling of 1683990 in words is "one million, six hundred eighty-three thousand, nine hundred ninety".