1689939 has 12 divisors (see below), whose sum is σ = 2457000. Its totient is φ = 1119264.

The previous prime is 1689931. The next prime is 1689967. The reversal of 1689939 is 9399861.

It is not a de Polignac number, because 1689939 - 2³ = 1689931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1689894 and 1689903.

It is not an unprimeable number, because it can be changed into a prime (1689931) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1087 + ... + 2135.

It is an arithmetic number, because the mean of its divisors is an integer number (204750).

2^1689939 is an apocalyptic number.

1689939 is a deficient number, since it is larger than the sum of its proper divisors (767061).

1689939 is a wasteful number, since it uses less digits than its factorization.

1689939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1234 (or 1231 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 1689939 is about 1299.9765382498. The cubic root of 1689939 is about 119.1124093773.

It can be divided in two parts, 1689 and 939, that added together give a triangular number (2628 = T₇₂).

The spelling of 1689939 in words is "one million, six hundred eighty-nine thousand, nine hundred thirty-nine".