208039690 has 16 divisors (see below), whose sum is σ = 380061792. Its totient is φ = 81973584.

The previous prime is 208039687. The next prime is 208039691. The reversal of 208039690 is 96930802.

208039690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×208039690² = 86561025230592200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (208039691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154584 + ... + 155923.

It is an arithmetic number, because the mean of its divisors is an integer number (23753862).

Almost surely, 2^208039690 is an apocalyptic number.

208039690 is a deficient number, since it is larger than the sum of its proper divisors (172022102).

208039690 is a wasteful number, since it uses less digits than its factorization.

208039690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310581.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 208039690 is about 14423.5810393952. The cubic root of 208039690 is about 592.5368976529.

The spelling of 208039690 in words is "two hundred eight million, thirty-nine thousand, six hundred ninety".