689886909 has 16 divisors (see below), whose sum is σ = 1066492800. Its totient is φ = 439927488.

The previous prime is 689886889. The next prime is 689886913. The reversal of 689886909 is 909688986.

It is not a de Polignac number, because 689886909 - 2¹¹ = 689884861 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689886949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 554844 + ... + 556085.

It is an arithmetic number, because the mean of its divisors is an integer number (66655800).

Almost surely, 2^689886909 is an apocalyptic number.

689886909 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

It is an amenable number.

689886909 is a deficient number, since it is larger than the sum of its proper divisors (376605891).

689886909 is a wasteful number, since it uses less digits than its factorization.

689886909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110961 (or 1110955 counting only the distinct ones).

The product of its (nonzero) digits is 13436928, while the sum is 63.

The square root of 689886909 is about 26265.6983345199. The cubic root of 689886909 is about 883.6073125521.

The spelling of 689886909 in words is "six hundred eighty-nine million, eight hundred eighty-six thousand, nine hundred nine".