199820078 has 4 divisors (see below), whose sum is σ = 299730120. Its totient is φ = 99910038.

The previous prime is 199820029. The next prime is 199820081. The reversal of 199820078 is 870028991.

199820078 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.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49955018 + ... + 49955021.

It is an arithmetic number, because the mean of its divisors is an integer number (74932530).

Almost surely, 2^199820078 is an apocalyptic number.

199820078 is a deficient number, since it is larger than the sum of its proper divisors (99910042).

199820078 is an equidigital number, since it uses as much as digits as its factorization.

199820078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99910041.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 199820078 is about 14135.7729891223. The cubic root of 199820078 is about 584.6281299897.

The spelling of 199820078 in words is "one hundred ninety-nine million, eight hundred twenty thousand, seventy-eight".