99999000 has 192 divisors, whose sum is σ = 347518080. Its totient is φ = 25920000.

The previous prime is 99998999. The next prime is 99999043. The reversal of 99999000 is 99999.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 368865 + ... + 369135.

It is an arithmetic number, because the mean of its divisors is an integer number (1809990).

Almost surely, 2^99999000 is an apocalyptic number.

99999000 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99999000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173759040).

99999000 is an abundant number, since it is smaller than the sum of its proper divisors (247519080).

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

99999000 is a wasteful number, since it uses less digits than its factorization.

99999000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339 (or 322 counting only the distinct ones).

The product of its (nonzero) digits is 59049, while the sum is 45.

The square root of 99999000 is about 9999.9499998750. The cubic root of 99999000 is about 464.1573361598.

99999000 divided by its reverse (99999) gives a cube (1000 = 10³).

It can be divided in two parts, 999 and 99000, that added together give a palindrome (99999).

The spelling of 99999000 in words is "ninety-nine million, nine hundred ninety-nine thousand".