1681890706 has 8 divisors (see below), whose sum is σ = 2534793264. Its totient is φ = 836959620.

The previous prime is 1681890703. The next prime is 1681890713. The reversal of 1681890706 is 6070981861.

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

It is not an unprimeable number, because it can be changed into a prime (1681890701) by changing a digit.

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, 1992340 + ... + 1993183.

It is an arithmetic number, because the mean of its divisors is an integer number (316849158).

Almost surely, 2^1681890706 is an apocalyptic number.

1681890706 is a deficient number, since it is larger than the sum of its proper divisors (852902558).

1681890706 is a wasteful number, since it uses less digits than its factorization.

1681890706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3985736.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 1681890706 is about 41010.8608297851. The cubic root of 1681890706 is about 1189.2301840300.

The spelling of 1681890706 in words is "one billion, six hundred eighty-one million, eight hundred ninety thousand, seven hundred six".