999987679 has 6 divisors (see below), whose sum is σ = 1002910160. Its totient is φ = 997073676.

The previous prime is 999987631. The next prime is 999987697. The reversal of 999987679 is 976789999.

It is a de Polignac number, because none of the positive numbers 2^k-999987679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999984679) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 125002 + ... + 132760.

Almost surely, 2^999987679 is an apocalyptic number.

999987679 is a deficient number, since it is larger than the sum of its proper divisors (2922481).

999987679 is an frugal number, since it uses more digits than its factorization.

999987679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8477 (or 8118 counting only the distinct ones).

The product of its digits is 138883248, while the sum is 73.

The square root of 999987679 is about 31622.5817889685. The cubic root of 999987679 is about 999.9958929831.

The spelling of 999987679 in words is "nine hundred ninety-nine million, nine hundred eighty-seven thousand, six hundred seventy-nine".