1681909716 has 24 divisors (see below), whose sum is σ = 4131006880. Its totient is φ = 531129312.

The previous prime is 1681909709. The next prime is 1681909717. The reversal of 1681909716 is 6179091861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681909717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3688171 + ... + 3688626.

Almost surely, 2^1681909716 is an apocalyptic number.

It is an amenable number.

1681909716 is an abundant number, since it is smaller than the sum of its proper divisors (2449097164).

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

1681909716 is a wasteful number, since it uses less digits than its factorization.

1681909716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7376823 (or 7376821 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 48.

The square root of 1681909716 is about 41011.0925970036. The cubic root of 1681909716 is about 1189.2346645393.

It can be divided in two parts, 168190 and 9716, that added together give a triangular number (177906 = T₅₉₆).

The spelling of 1681909716 in words is "one billion, six hundred eighty-one million, nine hundred nine thousand, seven hundred sixteen".