199495278 has 16 divisors (see below), whose sum is σ = 443322960. Its totient is φ = 66498408.

The previous prime is 199495271. The next prime is 199495337. The reversal of 199495278 is 872594991.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 3694357 = 199495278 / (1 + 9 + 9 + 4 + 9 + 5 + 2 + 7 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199495271) 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, 1847125 + ... + 1847232.

It is an arithmetic number, because the mean of its divisors is an integer number (27707685).

Almost surely, 2^199495278 is an apocalyptic number.

199495278 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

199495278 is an abundant number, since it is smaller than the sum of its proper divisors (243827682).

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

199495278 is a wasteful number, since it uses less digits than its factorization.

199495278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3694368 (or 3694362 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 54.

The square root of 199495278 is about 14124.2797338484. The cubic root of 199495278 is about 584.3111945473.

The spelling of 199495278 in words is "one hundred ninety-nine million, four hundred ninety-five thousand, two hundred seventy-eight".