199820077 has 4 divisors (see below), whose sum is σ = 204071616. Its totient is φ = 195568540.

The previous prime is 199820029. The next prime is 199820081. The reversal of 199820077 is 770028991.

It is a happy number.

199820077 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 199820077 - 2¹¹ = 199818029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199820177) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2125699 + ... + 2125792.

It is an arithmetic number, because the mean of its divisors is an integer number (51017904).

Almost surely, 2^199820077 is an apocalyptic number.

It is an amenable number.

199820077 is a deficient number, since it is larger than the sum of its proper divisors (4251539).

199820077 is an equidigital number, since it uses as much as digits as its factorization.

199820077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4251538.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 199820077 is about 14135.7729537511. The cubic root of 199820077 is about 584.6281290145.

The spelling of 199820077 in words is "one hundred ninety-nine million, eight hundred twenty thousand, seventy-seven".