199997370 has 96 divisors (see below), whose sum is σ = 544622400. Its totient is φ = 52223616.

The previous prime is 199997341. The next prime is 199997377. The reversal of 199997370 is 73799991.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (199997377) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1438761 + ... + 1438899.

It is an arithmetic number, because the mean of its divisors is an integer number (5673150).

Almost surely, 2^199997370 is an apocalyptic number.

199997370 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 199997370, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (272311200).

199997370 is an abundant number, since it is smaller than the sum of its proper divisors (344625030).

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

199997370 is a wasteful number, since it uses less digits than its factorization.

199997370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301 (or 222 counting only the distinct ones).

The product of its (nonzero) digits is 964467, while the sum is 54.

The square root of 199997370 is about 14142.0426388835. The cubic root of 199997370 is about 584.8009842425.

The spelling of 199997370 in words is "one hundred ninety-nine million, nine hundred ninety-seven thousand, three hundred seventy".