199902906 has 24 divisors (see below), whose sum is σ = 494997984. Its totient is φ = 57115080.

The previous prime is 199902869. The next prime is 199902907. The reversal of 199902906 is 609209991.

It is a happy number.

It is a super-2 number, since 2×199902906² = 79922343654489672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (199902907) 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, 793140 + ... + 793391.

It is an arithmetic number, because the mean of its divisors is an integer number (20624916).

Almost surely, 2^199902906 is an apocalyptic number.

199902906 is an abundant number, since it is smaller than the sum of its proper divisors (295095078).

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

199902906 is a wasteful number, since it uses less digits than its factorization.

199902906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1586546 (or 1586543 counting only the distinct ones).

The product of its (nonzero) digits is 78732, while the sum is 45.

The square root of 199902906 is about 14138.7024157099. The cubic root of 199902906 is about 584.7088974649.

The spelling of 199902906 in words is "one hundred ninety-nine million, nine hundred two thousand, nine hundred six".