1680817942 has 4 divisors (see below), whose sum is σ = 2521226916. Its totient is φ = 840408970.

The previous prime is 1680817913. The next prime is 1680817967. The reversal of 1680817942 is 2497180861.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 1680817892 and 1680817901.

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 as a sum of consecutive naturals, namely, 420204484 + ... + 420204487.

It is an arithmetic number, because the mean of its divisors is an integer number (630306729).

Almost surely, 2^1680817942 is an apocalyptic number.

1680817942 is a deficient number, since it is larger than the sum of its proper divisors (840408974).

1680817942 is an equidigital number, since it uses as much as digits as its factorization.

1680817942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840408973.

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 1680817942 is about 40997.7797203702. The cubic root of 1680817942 is about 1188.9772871639.

The spelling of 1680817942 in words is "one billion, six hundred eighty million, eight hundred seventeen thousand, nine hundred forty-two".