1683890 has 16 divisors (see below), whose sum is σ = 3264408. Its totient is φ = 621696.

The previous prime is 1683887. The next prime is 1683949. The reversal of 1683890 is 983861.

It can be written as a sum of positive squares in 4 ways, for example, as 657721 + 1026169 = 811^2 + 1013^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1683890.

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 7 ways as a sum of consecutive naturals, for example, 6347 + ... + 6606.

2^1683890 is an apocalyptic number.

1683890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1683890 is a deficient number, since it is larger than the sum of its proper divisors (1580518).

1683890 is a wasteful number, since it uses less digits than its factorization.

1683890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12973.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 1683890 is about 1297.6478721132. The cubic root of 1683890 is about 118.9701217270.

The spelling of 1683890 in words is "one million, six hundred eighty-three thousand, eight hundred ninety".