199642729 has 8 divisors (see below), whose sum is σ = 234545472. Its totient is φ = 167532240.

The previous prime is 199642711. The next prime is 199642763. The reversal of 199642729 is 927246991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 199642729 - 2¹¹ = 199640681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199642789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 697909 + ... + 698194.

It is an arithmetic number, because the mean of its divisors is an integer number (29318184).

Almost surely, 2^199642729 is an apocalyptic number.

It is an amenable number.

199642729 is a deficient number, since it is larger than the sum of its proper divisors (34902743).

199642729 is a wasteful number, since it uses less digits than its factorization.

199642729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396127.

The product of its digits is 489888, while the sum is 49.

The square root of 199642729 is about 14129.4985402880. The cubic root of 199642729 is about 584.4551178399.

The spelling of 199642729 in words is "one hundred ninety-nine million, six hundred forty-two thousand, seven hundred twenty-nine".