208138970 has 32 divisors (see below), whose sum is σ = 404345088. Its totient is φ = 76684608.

The previous prime is 208138967. The next prime is 208138981. The reversal of 208138970 is 79831802.

It is a Curzon 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 15 ways as a sum of consecutive naturals, for example, 69647 + ... + 72573.

It is an arithmetic number, because the mean of its divisors is an integer number (12635784).

Almost surely, 2^208138970 is an apocalyptic number.

208138970 is a deficient number, since it is larger than the sum of its proper divisors (196206118).

208138970 is a wasteful number, since it uses less digits than its factorization.

208138970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3494.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 208138970 is about 14427.0222152737. The cubic root of 208138970 is about 592.6311388174.

The spelling of 208138970 in words is "two hundred eight million, one hundred thirty-eight thousand, nine hundred seventy".