1688673369 has 4 divisors (see below), whose sum is σ = 2251564496. Its totient is φ = 1125782244.

The previous prime is 1688673367. The next prime is 1688673391. The reversal of 1688673369 is 9633768861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1688673369 - 2¹ = 1688673367 is a prime.

It is a super-2 number, since 2×1688673369² = 5703235494339620322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1688673367) 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, 281445559 + ... + 281445564.

It is an arithmetic number, because the mean of its divisors is an integer number (562891124).

Almost surely, 2^1688673369 is an apocalyptic number.

It is an amenable number.

1688673369 is a deficient number, since it is larger than the sum of its proper divisors (562891127).

1688673369 is an equidigital number, since it uses as much as digits as its factorization.

1688673369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562891126.

The product of its digits is 7838208, while the sum is 57.

The square root of 1688673369 is about 41093.4711237686. The cubic root of 1688673369 is about 1190.8266668492.

The spelling of 1688673369 in words is "one billion, six hundred eighty-eight million, six hundred seventy-three thousand, three hundred sixty-nine".