1688425406 has 8 divisors (see below), whose sum is σ = 2535595920. Its totient is φ = 843226768.

The previous prime is 1688425379. The next prime is 1688425421. The reversal of 1688425406 is 6045248861.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 490826 + ... + 494253.

It is an arithmetic number, because the mean of its divisors is an integer number (316949490).

Almost surely, 2^1688425406 is an apocalyptic number.

1688425406 is a deficient number, since it is larger than the sum of its proper divisors (847170514).

1688425406 is an equidigital number, since it uses as much as digits as its factorization.

1688425406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 985938.

The product of its (nonzero) digits is 368640, while the sum is 44.

The square root of 1688425406 is about 41090.4539522259. The cubic root of 1688425406 is about 1190.7683774226.

The spelling of 1688425406 in words is "one billion, six hundred eighty-eight million, four hundred twenty-five thousand, four hundred six".