1680945906 has 8 divisors (see below), whose sum is σ = 3361891824. Its totient is φ = 560315300.

The previous prime is 1680945901. The next prime is 1680945911. The reversal of 1680945906 is 6095490861.

It is an interprime number because it is at equal distance from previous prime (1680945901) and next prime (1680945911).

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

1680945906 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (1680945901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140078820 + ... + 140078831.

It is an arithmetic number, because the mean of its divisors is an integer number (420236478).

Almost surely, 2^1680945906 is an apocalyptic number.

1680945906 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1680945906 is a wasteful number, since it uses less digits than its factorization.

1680945906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280157656.

The product of its (nonzero) digits is 466560, while the sum is 48.

The square root of 1680945906 is about 40999.3403117660. The cubic root of 1680945906 is about 1189.0074594637.

The spelling of 1680945906 in words is "one billion, six hundred eighty million, nine hundred forty-five thousand, nine hundred six".