199997023500 has 144 divisors (see below), whose sum is σ = 632052596448. Its totient is φ = 53237136000.

The previous prime is 199997023487. The next prime is 199997023531. The reversal of 199997023500 is 5320799991.

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, 2494030 + ... + 2572970.

It is an arithmetic number, because the mean of its divisors is an integer number (4389254142).

Almost surely, 2^199997023500 is an apocalyptic number.

199997023500 is a gapful number since it is divisible by the number (10) 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 199997023500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (316026298224).

199997023500 is an abundant number, since it is smaller than the sum of its proper divisors (432055572948).

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

199997023500 is a wasteful number, since it uses less digits than its factorization.

199997023500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79529 (or 79514 counting only the distinct ones).

The product of its (nonzero) digits is 1377810, while the sum is 54.

The spelling of 199997023500 in words is "one hundred ninety-nine billion, nine hundred ninety-seven million, twenty-three thousand, five hundred".