199995642 has 80 divisors (see below), whose sum is σ = 558752832. Its totient is φ = 51943680.

The previous prime is 199995613. The next prime is 199995673. The reversal of 199995642 is 246599991.

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

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4458 + ... + 20490.

Almost surely, 2^199995642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 199995642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (279376416).

199995642 is an abundant number, since it is smaller than the sum of its proper divisors (358757190).

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

199995642 is a wasteful number, since it uses less digits than its factorization.

199995642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16065 (or 16056 counting only the distinct ones).

The product of its digits is 1574640, while the sum is 54.

The square root of 199995642 is about 14141.9815443240. The cubic root of 199995642 is about 584.7992999886.

The spelling of 199995642 in words is "one hundred ninety-nine million, nine hundred ninety-five thousand, six hundred forty-two".