999951872 has 60 divisors (see below), whose sum is σ = 2070650208. Its totient is φ = 481920000.

The previous prime is 999951863. The next prime is 999951877. The reversal of 999951872 is 278159999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999951877) 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, 3983747 + ... + 3983997.

Almost surely, 2^999951872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999951872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1035325104).

999951872 is an abundant number, since it is smaller than the sum of its proper divisors (1070698336).

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

999951872 is an frugal number, since it uses more digits than its factorization.

999951872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551 (or 284 counting only the distinct ones).

The product of its digits is 3674160, while the sum is 59.

The square root of 999951872 is about 31622.0156220314. The cubic root of 999951872 is about 999.9839570760.

The spelling of 999951872 in words is "nine hundred ninety-nine million, nine hundred fifty-one thousand, eight hundred seventy-two".