1688744159 has 6 divisors (see below), whose sum is σ = 1712880504. Its totient is φ = 1664617640.

The previous prime is 1688744093. The next prime is 1688744177. The reversal of 1688744159 is 9514478861.

It is a de Polignac number, because none of the positive numbers 2^k-1688744159 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1688744159.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1688749159) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 343829 + ... + 348705.

It is an arithmetic number, because the mean of its divisors is an integer number (285480084).

Almost surely, 2^1688744159 is an apocalyptic number.

1688744159 is a deficient number, since it is larger than the sum of its proper divisors (24136345).

1688744159 is an frugal number, since it uses more digits than its factorization.

1688744159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9825 (or 4948 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 53.

The square root of 1688744159 is about 41094.3324437811. The cubic root of 1688744159 is about 1190.8433066256.

The spelling of 1688744159 in words is "one billion, six hundred eighty-eight million, seven hundred forty-four thousand, one hundred fifty-nine".