1688315406 has 32 divisors (see below), whose sum is σ = 3411582720. Its totient is φ = 556972416.

The previous prime is 1688315353. The next prime is 1688315411. The reversal of 1688315406 is 6045138861.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 278055 + ... + 284061.

It is an arithmetic number, because the mean of its divisors is an integer number (106611960).

Almost surely, 2^1688315406 is an apocalyptic number.

1688315406 is an abundant number, since it is smaller than the sum of its proper divisors (1723267314).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1688315406 is a wasteful number, since it uses less digits than its factorization.

1688315406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6488.

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 1688315406 is about 41089.1154200233. The cubic root of 1688315406 is about 1190.7425175563.

The spelling of 1688315406 in words is "one billion, six hundred eighty-eight million, three hundred fifteen thousand, four hundred six".