199902156 has 12 divisors (see below), whose sum is σ = 466438392. Its totient is φ = 66634048.

The previous prime is 199902151. The next prime is 199902161. The reversal of 199902156 is 651209991.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (199902151) and next prime (199902161).

It is a tau number, because it is divible by the number of its divisors (12).

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

It is not an unprimeable number, because it can be changed into a prime (199902151) 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, 8329245 + ... + 8329268.

It is an arithmetic number, because the mean of its divisors is an integer number (38869866).

Almost surely, 2^199902156 is an apocalyptic number.

It is an amenable number.

199902156 is an abundant number, since it is smaller than the sum of its proper divisors (266536236).

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

199902156 is a wasteful number, since it uses less digits than its factorization.

199902156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16658520 (or 16658518 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 42.

The square root of 199902156 is about 14138.6758927419. The cubic root of 199902156 is about 584.7081662229.

The spelling of 199902156 in words is "one hundred ninety-nine million, nine hundred two thousand, one hundred fifty-six".