199678212 has 36 divisors (see below), whose sum is σ = 509748876. Its totient is φ = 65899200.

The previous prime is 199678207. The next prime is 199678217. The reversal of 199678212 is 212876991.

199678212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (199678207) and next prime (199678217).

It can be written as a sum of positive squares in 2 ways, for example, as 141705216 + 57972996 = 11904^2 + 7614^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (199678217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23823 + ... + 31094.

It is an arithmetic number, because the mean of its divisors is an integer number (14159691).

Almost surely, 2^199678212 is an apocalyptic number.

199678212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

199678212 is an abundant number, since it is smaller than the sum of its proper divisors (310070664).

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

199678212 is a wasteful number, since it uses less digits than its factorization.

199678212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55028 (or 55023 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 199678212 is about 14130.7541200036. The cubic root of 199678212 is about 584.4897413439.

It can be divided in two parts, 1996 and 78212, that added together give a palindrome (80208).

The spelling of 199678212 in words is "one hundred ninety-nine million, six hundred seventy-eight thousand, two hundred twelve".