1689736444 has 48 divisors (see below), whose sum is σ = 3332280672. Its totient is φ = 749232000.

The previous prime is 1689736427. The next prime is 1689736463. The reversal of 1689736444 is 4446379861.

It is a junction number, because it is equal to n+sod(n) for n = 1689736391 and 1689736400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 214414 + ... + 222154.

It is an arithmetic number, because the mean of its divisors is an integer number (69422514).

Almost surely, 2^1689736444 is an apocalyptic number.

It is an amenable number.

1689736444 is a deficient number, since it is larger than the sum of its proper divisors (1642544228).

1689736444 is a wasteful number, since it uses less digits than its factorization.

1689736444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7819 (or 7795 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 52.

The square root of 1689736444 is about 41106.4039293150. The cubic root of 1689736444 is about 1191.0765025141.

The spelling of 1689736444 in words is "one billion, six hundred eighty-nine million, seven hundred thirty-six thousand, four hundred forty-four".