1689669218 has 8 divisors (see below), whose sum is σ = 2570201280. Its totient is φ = 832935460.

The previous prime is 1689669211. The next prime is 1689669257. The reversal of 1689669218 is 8129669861.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1689669211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5949398 + ... + 5949681.

It is an arithmetic number, because the mean of its divisors is an integer number (321275160).

Almost surely, 2^1689669218 is an apocalyptic number.

1689669218 is a deficient number, since it is larger than the sum of its proper divisors (880532062).

1689669218 is a wasteful number, since it uses less digits than its factorization.

1689669218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11899152.

The product of its digits is 2239488, while the sum is 56.

The square root of 1689669218 is about 41105.5862140415. The cubic root of 1689669218 is about 1191.0607066837.

The spelling of 1689669218 in words is "one billion, six hundred eighty-nine million, six hundred sixty-nine thousand, two hundred eighteen".