208870390 has 16 divisors (see below), whose sum is σ = 377918208. Its totient is φ = 83114496.

The previous prime is 208870379. The next prime is 208870411. The reversal of 208870390 is 93078802.

It is a congruent 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, 52182 + ... + 56041.

It is an arithmetic number, because the mean of its divisors is an integer number (23619888).

Almost surely, 2^208870390 is an apocalyptic number.

208870390 is a deficient number, since it is larger than the sum of its proper divisors (169047818).

208870390 is a wasteful number, since it uses less digits than its factorization.

208870390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108423.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 208870390 is about 14452.3489440298. The cubic root of 208870390 is about 593.3245145206.

The spelling of 208870390 in words is "two hundred eight million, eight hundred seventy thousand, three hundred ninety".