1681952208 has 40 divisors (see below), whose sum is σ = 4494876000. Its totient is φ = 541317504.

The previous prime is 1681952203. The next prime is 1681952221. The reversal of 1681952208 is 8022591861.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1681952208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681952201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 602758 + ... + 605541.

It is an arithmetic number, because the mean of its divisors is an integer number (112371900).

Almost surely, 2^1681952208 is an apocalyptic number.

It is an amenable number.

1681952208 is an abundant number, since it is smaller than the sum of its proper divisors (2812923792).

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

1681952208 is a wasteful number, since it uses less digits than its factorization.

1681952208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1208339 (or 1208333 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 42.

The square root of 1681952208 is about 41011.6106486931. The cubic root of 1681952208 is about 1189.2446794514.

The spelling of 1681952208 in words is "one billion, six hundred eighty-one million, nine hundred fifty-two thousand, two hundred eight".