1680602391 has 32 divisors (see below), whose sum is σ = 2683773120. Its totient is φ = 1033264512.

The previous prime is 1680602389. The next prime is 1680602401. The reversal of 1680602391 is 1932060861.

1680602391 is a `hidden beast` number, since 16 + 8 + 0 + 602 + 39 + 1 = 666.

It is not a de Polignac number, because 1680602391 - 2¹ = 1680602389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680602321) 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 31 ways as a sum of consecutive naturals, for example, 677245 + ... + 679721.

It is an arithmetic number, because the mean of its divisors is an integer number (83867910).

Almost surely, 2^1680602391 is an apocalyptic number.

1680602391 is a deficient number, since it is larger than the sum of its proper divisors (1003170729).

1680602391 is a wasteful number, since it uses less digits than its factorization.

1680602391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4432 (or 4426 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 1680602391 is about 40995.1508229937. The cubic root of 1680602391 is about 1188.9264594898.

The spelling of 1680602391 in words is "one billion, six hundred eighty million, six hundred two thousand, three hundred ninety-one".