199729765 has 4 divisors (see below), whose sum is σ = 239675724. Its totient is φ = 159783808.

The previous prime is 199729741. The next prime is 199729781. The reversal of 199729765 is 567927991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 67617729 + 132112036 = 8223^2 + 11494^2 .

It is a cyclic number.

It is not a de Polignac number, because 199729765 - 2⁹ = 199729253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19972972 + ... + 19972981.

It is an arithmetic number, because the mean of its divisors is an integer number (59918931).

Almost surely, 2^199729765 is an apocalyptic number.

It is an amenable number.

199729765 is a deficient number, since it is larger than the sum of its proper divisors (39945959).

199729765 is an equidigital number, since it uses as much as digits as its factorization.

199729765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39945958.

The product of its digits is 2143260, while the sum is 55.

The square root of 199729765 is about 14132.5781441321. The cubic root of 199729765 is about 584.5400382800.

The spelling of 199729765 in words is "one hundred ninety-nine million, seven hundred twenty-nine thousand, seven hundred sixty-five".