999969872 has 20 divisors (see below), whose sum is σ = 2113573056. Its totient is φ = 454531680.

The previous prime is 999969857. The next prime is 999969877. The reversal of 999969872 is 278969999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999969877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2840648 + ... + 2840999.

Almost surely, 2^999969872 is an apocalyptic number.

It is an amenable number.

999969872 is an abundant number, since it is smaller than the sum of its proper divisors (1113603184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999969872 is a wasteful number, since it uses less digits than its factorization.

999969872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5681666 (or 5681660 counting only the distinct ones).

The product of its digits is 39680928, while the sum is 68.

The square root of 999969872 is about 31622.3002325890. The cubic root of 999969872 is about 999.9899572325.

The spelling of 999969872 in words is "nine hundred ninety-nine million, nine hundred sixty-nine thousand, eight hundred seventy-two".