199642170 has 192 divisors, whose sum is σ = 621444096. Its totient is φ = 40642560.

The previous prime is 199642153. The next prime is 199642171. The reversal of 199642170 is 71246991.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (199642171) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 592242 + ... + 592578.

It is an arithmetic number, because the mean of its divisors is an integer number (3236688).

Almost surely, 2^199642170 is an apocalyptic number.

199642170 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 199642170, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (310722048).

199642170 is an abundant number, since it is smaller than the sum of its proper divisors (421801926).

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

199642170 is a wasteful number, since it uses less digits than its factorization.

199642170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405 (or 398 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 199642170 is about 14129.4787589635. The cubic root of 199642170 is about 584.4545723476.

The spelling of 199642170 in words is "one hundred ninety-nine million, six hundred forty-two thousand, one hundred seventy".