1688743213 has 8 divisors (see below), whose sum is σ = 1713671960. Its totient is φ = 1663986240.

The previous prime is 1688743207. The next prime is 1688743247. The reversal of 1688743213 is 3123478861.

It can be written as a sum of positive squares in 4 ways, for example, as 53187849 + 1635555364 = 7293^2 + 40442^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1688743213 - 2⁵ = 1688743181 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 1688743213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1688743613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23070 + ... + 62527.

It is an arithmetic number, because the mean of its divisors is an integer number (214208995).

Almost surely, 2^1688743213 is an apocalyptic number.

It is an amenable number.

1688743213 is a deficient number, since it is larger than the sum of its proper divisors (24928747).

1688743213 is a wasteful number, since it uses less digits than its factorization.

1688743213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85887.

The product of its digits is 193536, while the sum is 43.

The square root of 1688743213 is about 41094.3209336765. The cubic root of 1688743213 is about 1190.8430842635.

The spelling of 1688743213 in words is "one billion, six hundred eighty-eight million, seven hundred forty-three thousand, two hundred thirteen".