1689689019 has 12 divisors (see below), whose sum is σ = 2377735656. Its totient is φ = 1067171328.

The previous prime is 1689689003. The next prime is 1689689033. The reversal of 1689689019 is 9109869861.

It is not a de Polignac number, because 1689689019 - 2⁴ = 1689689003 is a prime.

It is a super-2 number, since 2×1689689019² = 5710097961858364722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a self number, because there is not a number n which added to its sum of digits gives 1689689019.

It is not an unprimeable number, because it can be changed into a prime (1689689059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 779014 + ... + 781179.

It is an arithmetic number, because the mean of its divisors is an integer number (198144638).

Almost surely, 2^1689689019 is an apocalyptic number.

1689689019 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1689689019 is a deficient number, since it is larger than the sum of its proper divisors (688046637).

1689689019 is a wasteful number, since it uses less digits than its factorization.

1689689019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560234 (or 1560215 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 57.

The square root of 1689689019 is about 41105.8270686773. The cubic root of 1689689019 is about 1191.0653592908.

The spelling of 1689689019 in words is "one billion, six hundred eighty-nine million, six hundred eighty-nine thousand, nineteen".