209172146 has 16 divisors (see below), whose sum is σ = 316650048. Its totient is φ = 103626000.

The previous prime is 209172109. The next prime is 209172179. The reversal of 209172146 is 641271902.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171836 + ... + 173048.

It is an arithmetic number, because the mean of its divisors is an integer number (19790628).

Almost surely, 2^209172146 is an apocalyptic number.

209172146 is a deficient number, since it is larger than the sum of its proper divisors (107477902).

209172146 is a wasteful number, since it uses less digits than its factorization.

209172146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1937.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 209172146 is about 14462.7848632274. The cubic root of 209172146 is about 593.6101032402.

The spelling of 209172146 in words is "two hundred nine million, one hundred seventy-two thousand, one hundred forty-six".