199051278 has 16 divisors (see below), whose sum is σ = 398960640. Its totient is φ = 66207416.

The previous prime is 199051271. The next prime is 199051289. The reversal of 199051278 is 872150991.

199051278 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×199051278² = 79242822546866568, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199051271) 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, 32718 + ... + 38321.

It is an arithmetic number, because the mean of its divisors is an integer number (24935040).

Almost surely, 2^199051278 is an apocalyptic number.

199051278 is an abundant number, since it is smaller than the sum of its proper divisors (199909362).

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

199051278 is a wasteful number, since it uses less digits than its factorization.

199051278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71511.

The product of its (nonzero) digits is 45360, while the sum is 42.

The square root of 199051278 is about 14108.5533631198. The cubic root of 199051278 is about 583.8773883301.

The spelling of 199051278 in words is "one hundred ninety-nine million, fifty-one thousand, two hundred seventy-eight".