1985672689 has 16 divisors (see below), whose sum is σ = 2666079360. Its totient is φ = 1428255360.

The previous prime is 1985672687. The next prime is 1985672693. The reversal of 1985672689 is 9862765891.

It is not a de Polignac number, because 1985672689 - 2¹ = 1985672687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1985672687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 990844 + ... + 992845.

It is an arithmetic number, because the mean of its divisors is an integer number (166629960).

Almost surely, 2^1985672689 is an apocalyptic number.

It is an amenable number.

1985672689 is a deficient number, since it is larger than the sum of its proper divisors (680406671).

1985672689 is a wasteful number, since it uses less digits than its factorization.

1985672689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1983720.

The product of its digits is 13063680, while the sum is 61.

The square root of 1985672689 is about 44560.8874350590. The cubic root of 1985672689 is about 1256.9052903159.

The spelling of 1985672689 in words is "one billion, nine hundred eighty-five million, six hundred seventy-two thousand, six hundred eighty-nine".