999729900 has 108 divisors (see below), whose sum is σ = 3374683312. Its totient is φ = 246084480.

The previous prime is 999729853. The next prime is 999729901. The reversal of 999729900 is 9927999.

It is not an unprimeable number, because it can be changed into a prime (999729901) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 31024 + ... + 54423.

Almost surely, 2^999729900 is an apocalyptic number.

999729900 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

999729900 is an abundant number, since it is smaller than the sum of its proper divisors (2374953412).

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

999729900 is a wasteful number, since it uses less digits than its factorization.

999729900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85480 (or 85470 counting only the distinct ones).

The product of its (nonzero) digits is 826686, while the sum is 54.

The square root of 999729900 is about 31618.5056572887. The cubic root of 999729900 is about 999.9099585594.

The spelling of 999729900 in words is "nine hundred ninety-nine million, seven hundred twenty-nine thousand, nine hundred".