208531990 has 16 divisors (see below), whose sum is σ = 375522480. Its totient is φ = 83376160.

The previous prime is 208531987. The next prime is 208532003. The reversal of 208531990 is 99135802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39825 + ... + 44755.

It is an arithmetic number, because the mean of its divisors is an integer number (23470155).

Almost surely, 2^208531990 is an apocalyptic number.

208531990 is a deficient number, since it is larger than the sum of its proper divisors (166990490).

208531990 is a wasteful number, since it uses less digits than its factorization.

208531990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9167.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 208531990 is about 14440.6367588137. The cubic root of 208531990 is about 593.0039177065.

The spelling of 208531990 in words is "two hundred eight million, five hundred thirty-one thousand, nine hundred ninety".