1689688247 has 8 divisors (see below), whose sum is σ = 1820331744. Its totient is φ = 1559140128.

The previous prime is 1689688241. The next prime is 1689688271. The reversal of 1689688247 is 7428869861.

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

It is not a de Polignac number, because 1689688247 - 2¹² = 1689684151 is a prime.

It is a super-3 number, since 3×1689688247³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1689688241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15353 + ... + 60125.

It is an arithmetic number, because the mean of its divisors is an integer number (227541468).

Almost surely, 2^1689688247 is an apocalyptic number.

1689688247 is a deficient number, since it is larger than the sum of its proper divisors (130643497).

1689688247 is a wasteful number, since it uses less digits than its factorization.

1689688247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47689.

The product of its digits is 9289728, while the sum is 59.

The square root of 1689688247 is about 41105.8176782800. The cubic root of 1689688247 is about 1191.0651778959.

The spelling of 1689688247 in words is "one billion, six hundred eighty-nine million, six hundred eighty-eight thousand, two hundred forty-seven".