208939970 has 16 divisors (see below), whose sum is σ = 379608768. Its totient is φ = 82794480.

The previous prime is 208939961. The next prime is 208939987. The reversal of 208939970 is 79939802.

208939970 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×208939970² = 87311822127201800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96566 + ... + 98705.

It is an arithmetic number, because the mean of its divisors is an integer number (23725548).

Almost surely, 2^208939970 is an apocalyptic number.

208939970 is a deficient number, since it is larger than the sum of its proper divisors (170668798).

208939970 is a wasteful number, since it uses less digits than its factorization.

208939970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195385.

The product of its (nonzero) digits is 244944, while the sum is 47.

The square root of 208939970 is about 14454.7559647335. The cubic root of 208939970 is about 593.3903909976.

The spelling of 208939970 in words is "two hundred eight million, nine hundred thirty-nine thousand, nine hundred seventy".