1688981427 has 12 divisors (see below), whose sum is σ = 2788159920. Its totient is φ = 965132208.

The previous prime is 1688981423. The next prime is 1688981443. The reversal of 1688981427 is 7241898861.

1688981427 is a `hidden beast` number, since 1 + 68 + 89 + 81 + 427 = 666.

It is not a de Polignac number, because 1688981427 - 2² = 1688981423 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1688981423) 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 11 ways as a sum of consecutive naturals, for example, 13404552 + ... + 13404677.

It is an arithmetic number, because the mean of its divisors is an integer number (232346660).

Almost surely, 2^1688981427 is an apocalyptic number.

1688981427 is a deficient number, since it is larger than the sum of its proper divisors (1099178493).

1688981427 is a wasteful number, since it uses less digits than its factorization.

1688981427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26809242 (or 26809239 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 54.

The square root of 1688981427 is about 41097.2192124966. The cubic root of 1688981427 is about 1190.8990750451.

The spelling of 1688981427 in words is "one billion, six hundred eighty-eight million, nine hundred eighty-one thousand, four hundred twenty-seven".