1688984427 has 8 divisors (see below), whose sum is σ = 2425208464. Its totient is φ = 1039375008.

The previous prime is 1688984411. The next prime is 1688984477. The reversal of 1688984427 is 7244898861.

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

It is not a de Polignac number, because 1688984427 - 2⁴ = 1688984411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1688984477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21653608 + ... + 21653685.

It is an arithmetic number, because the mean of its divisors is an integer number (303151058).

Almost surely, 2^1688984427 is an apocalyptic number.

1688984427 is a deficient number, since it is larger than the sum of its proper divisors (736224037).

1688984427 is a wasteful number, since it uses less digits than its factorization.

1688984427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43307309.

The product of its digits is 6193152, while the sum is 57.

The square root of 1688984427 is about 41097.2557113002. The cubic root of 1688984427 is about 1190.8997801436.

The spelling of 1688984427 in words is "one billion, six hundred eighty-eight million, nine hundred eighty-four thousand, four hundred twenty-seven".