1994877687 has 16 divisors (see below), whose sum is σ = 2922826752. Its totient is φ = 1200189120.

The previous prime is 1994877671. The next prime is 1994877691. The reversal of 1994877687 is 7867784991.

It is a happy number.

It is not a de Polignac number, because 1994877687 - 2⁴ = 1994877671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1994877617) 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, 216103 + ... + 225144.

It is an arithmetic number, because the mean of its divisors is an integer number (182676672).

Almost surely, 2^1994877687 is an apocalyptic number.

1994877687 is a deficient number, since it is larger than the sum of its proper divisors (927949065).

1994877687 is a wasteful number, since it uses less digits than its factorization.

1994877687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441398.

The product of its digits is 42674688, while the sum is 66.

The square root of 1994877687 is about 44664.0536337668. The cubic root of 1994877687 is about 1258.8445119816.

The spelling of 1994877687 in words is "one billion, nine hundred ninety-four million, eight hundred seventy-seven thousand, six hundred eighty-seven".