1680239906 has 8 divisors (see below), whose sum is σ = 2527381440. Its totient is φ = 837779428.

The previous prime is 1680239887. The next prime is 1680239941. The reversal of 1680239906 is 6099320861.

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

It is a super-2 number, since 2×1680239906² = 5646412283429777672, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 1169366 + ... + 1170801.

It is an arithmetic number, because the mean of its divisors is an integer number (315922680).

Almost surely, 2^1680239906 is an apocalyptic number.

1680239906 is a deficient number, since it is larger than the sum of its proper divisors (847141534).

1680239906 is a wasteful number, since it uses less digits than its factorization.

1680239906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2340528.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 1680239906 is about 40990.7295129033. The cubic root of 1680239906 is about 1188.8409744680.

The spelling of 1680239906 in words is "one billion, six hundred eighty million, two hundred thirty-nine thousand, nine hundred six".