1681587938 has 16 divisors (see below), whose sum is σ = 2532487680. Its totient is φ = 837433056.

The previous prime is 1681587931. The next prime is 1681587959. The reversal of 1681587938 is 8397851861.

It is not an unprimeable number, because it can be changed into a prime (1681587931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 618470 + ... + 621182.

It is an arithmetic number, because the mean of its divisors is an integer number (158280480).

Almost surely, 2^1681587938 is an apocalyptic number.

1681587938 is a deficient number, since it is larger than the sum of its proper divisors (850899742).

1681587938 is a wasteful number, since it uses less digits than its factorization.

1681587938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3841.

The product of its digits is 2903040, while the sum is 56.

The square root of 1681587938 is about 41007.1693487858. The cubic root of 1681587938 is about 1189.1588194142.

The spelling of 1681587938 in words is "one billion, six hundred eighty-one million, five hundred eighty-seven thousand, nine hundred thirty-eight".