1689970 has 16 divisors (see below), whose sum is σ = 3221208. Its totient is φ = 636160.

The previous prime is 1689967. The next prime is 1690009. The reversal of 1689970 is 799861.

It can be written as a sum of positive squares in 4 ways, for example, as 986049 + 703921 = 993^2 + 839^2 .

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, 4801 + ... + 5140.

2^1689970 is an apocalyptic number.

1689970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1689970 is a deficient number, since it is larger than the sum of its proper divisors (1531238).

1689970 is a wasteful number, since it uses less digits than its factorization.

1689970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9965.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 1689970 is about 1299.9884614873. The cubic root of 1689970 is about 119.1131376998.

The spelling of 1689970 in words is "one million, six hundred eighty-nine thousand, nine hundred seventy".